Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (2024)

Published . Last updated by Judy Purcell 33 Comments

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Broccoli-Cauliflower Gratin with a grownup Brie and cheddar cheese sauce is a side dish everyone loves to see on the table at dinnertime.

Leftovers create an amazing creamy soup too!

Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (1)

Easy Vegetable Side Dish

Broccoli and Cauliflower Gratin is an easy recipe to customize to your own taste. Roast or steam the vegetables and select any favorite cheese with good melting properties from the list below.

You’ll also find simple substitutes formaking it gluten-free with sweet rice flour while maintaining the integrity and quality of the dish.

How to Make a Great Cheese Sauce

  • Know your cheese. The selection of cheese is important for melting properties and flavor. We choose Brie to deliver a creamy, luxurious texture with extra-sharp cheddar and Parmesan to bring some punch.
    ⇒ Gruyere, Gouda, Fontina, Asiago, Provolone, Swiss, Taleggio, or Reblochon-Style cheese are all terrific choices for an amazing cheese sauce. Mozzarella can be used but is challenging to keep smooth and not stringy. Use only pure, real cheese, and never cheese foods.
  • Balance with acid and a touch of spice. An acid like Dijon paired with a tiny bit of spice from cayenne brings a welcome contrast to heavier foods and sauces.
  • Grate the cheese yourself. Pre-grated cheese will often have a coating of cellulose to keep it from sticking together in the package. This can inhibit a cohesive melting or leave the sauce slightly gritty. Grate the cheese from a block using a small hole grater—the more finely grated it is, the easier it will melt.
  • Go low and slow. Keep the heat low enough so the sauce forms large bubbles that pop slowly, like scattered raindrops. Stir constantly to keep everything smooth and silky.
  • Don’t overcook cheese sauce. The proteins in cheese will change the consistency if overheated. Bring the cheese to room temperature so it isn’t cold when adding it to the sauce. After the sauce has thickened, remove the sauce from heat before adding the cheese. The heat from the sauce will melt the cheese as you stir it in.

Just in case the phone rings or phone notifications distract(it happens), here’s an excellent resource forTIPS to save a broken sauce: Taste of Home, How to Save a Broken Sauce

Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (2)

Broccoli & Cauliflower Gratin Step by Step

  1. Roast vegetables at 400°F for 8-10 minutes.
  2. Make the cheese sauce by heating the butter in a saucepan until bubbly. Whisk in flour and cook on medium-low for 3-4 minutes. Reduce heat to low and whisk in milk, Dijon, and a pinch of cayenne; barely simmer on low about 5 minutes. Remove from heat and stir-in brie and cheddar cheese, continuing to stir until cheese is melted.
  3. Pour the sauce over the vegetables and sprinkle with Parmesan and bread crumbs. Spray crumbs lightly with cooking spray.
  4. Broil for 10 minutes until the cheese is bubbly and topping is lightly browned in spots.
Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (3)

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Gratin One Night, Soup for Lunch

My advice is to make more than you think you’ll need because it makes a fantastic cream soup for lunches. To make soup with leftovers, simply place leftovers in a food processor or use an immersion blender to puree until smooth.

Gently warm in a saucepan and thin with chicken broth or water to the desired consistency. Garnish with fresh chopped scallions or chives to serve.

Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (4)

More Vegetable Side Dish Recipes Your Family Will Love

  • Tuscan Roasted Broccoli
  • Roasted Vegetable Medley
  • Vegetable Tian
  • Grilled Asparagus with Cotija Cheese
  • Skillet Roasted Cauliflower Mash
  • Grilled Cabbage with Classic Caesar Dressing
  • Roasted Brussels Sprouts with Garlic Aioli
  • Roasted Asparagus with Caramelized Onions and Blue Cheese

Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (5)

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Broccoli-Cauliflower Gratin

Broccoli and cauliflower cradled in a Brie and cheddar cheese sauce and topped with panko bread crumbs for a creamy-crunchy vegetable side dish.

Prep Time10 minutes mins

Cook Time25 minutes mins

Total Time35 minutes mins

Course: Side Dish

Cuisine: American

Servings: 6 Servings

Author: Judy Purcell

Ingredients

  • 16 ounces cauliflower , cut into bite-sized pieces slightly smaller than the broccoli
  • 16 ounces broccoli cut into bite-sized pieces
  • Sea salt and freshly ground pepper
  • 2 1/2 tablespoons butter
  • 2 tablespoons white whole wheat flour or sweet rice flour for gluten-free
  • 1 cup whole milk plus more to thin sauce as desired
  • 1/2 teaspoon Dijon mustard or 1 teaspoon lemon juice
  • Pinch cayenne pepper
  • 1 cup Brie cheese cut into small cubes
  • 3/4 cup grated extra-sharp cheddar cheese
  • 1/2 cup grated Parmesan cheese
  • 1/2 cup panko bread crumbs or gluten-free Panko crumbs
  • pinch ground white pepper
  • Olive oil cooking spray or duck fat spray
  • 9×13 Broiler-safe baking dish

Instructions

  • Season cauliflower and broccoli with salt and pepper. Roast in a 400°F oven for 8-10 minutes -OR- steam in a large skillet with a lid and 1/3 cup water over medium heat for 5-6 minutes until crisp-tender. (Add more water, if needed)

  • While the vegetables are cooking, melt 2 1/2 tablespoons butter In a medium saucepan. Use this melted butter to brush in the baking dish and then transfer vegetables to the baking pan in a single layer. Heat the broiler and position rack 8-10 inches from the heating element. Note: If you don’t have a broiler-safe dish, bake on convection bake at 400°F – this will brown the top more efficiently without overcooking the cheese sauce.

  • Return the remaining butter to the stove and heat until bubbly. Add 2 tablespoons flour and whisk over medium heat until bubbly. Continue to cook on medium-low for 3-4 minutes to incorporate the flour fully.

  • Reduce heat to low and whisk in 1 cup of milk, 1/2 teaspoon Dijon, and a pinch of cayenne; continue to stir and gently simmer on low about 5 minutes or until sauce thickens. Remove from heat and stir-in 1 cup cubed Brie and 3/4 cup cheddar cheese, continuing to stir until cheese is melted. Taste and season with salt and pepper.

  • Pour the sauce over the vegetables and sprinkle with Parmesan and bread crumbs. Spray crumbs lightly with cooking spray and broil for 10 minutes (depending on broiler – watch closely) until the cheese is bubbly and topping is lightly browned in spots.

Notes

Make Ahead TIP: Make ahead and cover for up to an hour. Dress with the bread crumbs and Parmesan just before putting in the oven.

Make it Gluten-Free: Substitute sweet rice flour for wheat flour and use gluten-free bread crumbs in place of the regular bread crumbs.

Cheese TIP: Brie has a soft white rind that is fine to add to the sauce, however, remove any dry edges as they do not melt as well. The soft rind may not completely melt, but that’s okay and not noticeable in the final dish.

Nutrition

Serving: 6g | Calories: 291kcal | Carbohydrates: 12g | Protein: 16g | Fat: 20g | Saturated Fat: 12g | Cholesterol: 61mg | Sodium: 508mg | Potassium: 402mg | Fiber: 3g | Sugar: 3g | Vitamin A: 2045IU | Vitamin C: 38.8mg | Calcium: 373mg | Iron: 2mg

Learn how to make this and all recipes even easier!Check out our Monthly Meal Prep System!

If you try this or any other recipe on the blog,please rate the recipeand let me know how it went for you in the comments below. It makes my day to hear from you!

Broccoli-Cauliflower Gratin recipe with Brie and Cheddar Cheese Sauce (2024)

FAQs

Why is my cauliflower gratin watery? ›

The watery problem happens when the cauliflower is either overcooked or not drained well enough after a quick blanching.

Why does my cauliflower cheese sauce split? ›

Cook your cauliflower cheese at the right temperature, otherwise your cheese sauce can split. If your cheese sauce splits before that, it can be down to leaving it out too long, or you've boiled the sauce. If this happens, add a splash of milk or cream and whisk vigorously and it should come back to life.

How to can broccoli and cauliflower? ›

As a low acid food these vegetables would need to be pressure canned and there are no scientifically tested recipes for canning broccoli or cauliflower as a plain vegetable. Additionally, at the higher temperatures achieved during pressure canning the product would soften to the point that it would not be palatable.

How to prevent cauliflower cheese from going watery? ›

Drain well

Make sure you drain the cauliflower really well after it's boiled up and before you add it to the dish, otherwise it will end up too watery.

How to make a casserole less watery? ›

Thicken a meat casserole the most popular way with flour.

Add some flour to your pan after you've browned the meat and before adding any liquid. This way, the flour will soak up the juices and fat in the pan. Add about one teaspoon of flour at a time until you get the right thickness.

Why do you soak cauliflower before cooking? ›

If you're planning to roast the cauliflower whole or slice it into steaks, slice off the thick stem at the base. Drop the whole cauliflower head upside-down into cool, salted water. Let it soak for 10 to 15 minutes to remove dirt, residue and bugs.

Can I use self-raising flour instead of plain flour for cheese sauce? ›

Can I use self-raising flour for the Macaroni and cheese sauce? You can. You might want to adjust the flavor for the added baking powder in the flour.

How long does cauliflower cheese keep in the fridge? ›

How long can you keep Cauliflower Cheese in the fridge? Once you've put it out, ideally you should eat it within 4 hours. If you allow any leftovers to cool, make sure to refrigerate in a container with a lid and chill. You can keep leftovers of Cauliflower Cheese in the fridge for approximately 3 days or so.

How to stop cheese sauce from splitting in the oven? ›

Likewise, if you're making a sauce in the oven, use low heat. Egg yolks are often used as a thickening agent in sauces, but if you cook them for too long at too high a temperature, the proteins will start to denature and form curds. Flour has similar properties, especially if it's not cooked in butter first.

How to avoid cheese sauce curdling? ›

Low and slow is the key. To achieve a velvety, hom*ogenous cheese sauce, you must slowly heat our cheese. The curdles in a cheese sauce come as a result of overheating the proteins in the cheese, which causes them to separate from the fat and water content, per The Washington Post.

How do you get the liquid out of cauliflower? ›

I've done it. It really is as simple as putting the cooked and cooled cauliflower on a clean flour sack towel , wrapping it up and squeezing all the water out. I like to use flour sack towels because they're large and really thin, which makes them easy to squeeze tight and get out as much water as possible.

What is the healthiest way to eat broccoli and cauliflower? ›

While eating them raw is the best way to consume broccoli, cauliflower, or broccoflower your next best option could be to steam them. Without contact with boiling water, steaming is a gentler way to cook.

What is the mix between broccoli and cauliflower? ›

Romanesco goes by various names, including Romanesco broccoli, fractal broccoli, or Roman cauliflower, though it's considered to be a hybrid between cauliflower and broccoli. And it's part of the Brassica genus (also known as cruciferous vegetables), just like Brussels sprouts, cabbage, and kale.

Should you wash broccoli and cauliflower? ›

The natural nooks and crevices in broccoli and cauliflower are the perfect hiding spot for dirt, germs and even little bugs. Get your cruciferous veggies squeaky clean by filling a sink with cold water and then soaking them for a few minutes.

How do you fix watery scalloped potatoes? ›

A sauce that's too thin can result in a watery dish lacking the rich, luxurious texture that scalloped potatoes are famous for. Thankfully, there's a simple and effective solution to this problem: Use instant potato flakes.

How do you make cauliflower rice less watery? ›

The best way to deal with the liquid is to put the riced cauliflower in a covered microwave-safe dish, heat it thoroughly to get all the liquid out of it you can, then drain it. If you have to cook it on the stovetop, add as little water as possible and stir frequently to keep it from sticking to the pan.

Why is my baked cauliflower soggy? ›

Crowding the cauliflower on the pan could make them cook up mushy and a bit soggy. Leave some space between the florets. Be sure not to use too much olive oil to cook them.

References

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