Name: Cheesy Cauliflower Casserole
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Ingredients: 1 head of cauliflower; 1/4 cup of butter; 1/3 cup of flour; 3/4 cup of milk; 1 cup of old cheddar; 1 cup of parmesan cheese; 1 pinch of nutmeg; 1 pinch of salt and pepper

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This Cheesy Cauliflower Casserole is extra cheesy, flavored with thyme, and is an easy recipe to prepare. You will enjoy the creaminess from the Mornay sauce topped with golden parmesan cheese. This is a delicious side dish to serve for a special evening with friends, Thanksgiving, or Christmas dinner. Just like our Traditional Cheesy Broccoli Casserole.

Cauliflower is such a versatile vegetable: you can prepare a comforting casserole like the broccoli cauliflower cheese bake or this whole roasted cauliflower with parmesan sauce or a keto-friendly and healthier gluten-free “fried rice”. Just add a great Cheese Sauce and you have a wonderful side too.

Top view of a cheesy cauliflower casserole with a vintage spoon in it, a small ramekin of grated parmesan on the side and a grey tea towel.

Most of all, this homemade cauliflower dish is an amazing add-on to your next gathering and will impress everyone. My whole family loves this gratin, and I’m confident yours will too.

Also, this is a great moment to shine and show your French cooking skills as we are going to take the Bechamel sauce to the next level and into a Mornay sauce.

Helpful Items For This Recipe

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2 Quart Glass Baking Dish with Red Plastic Lid – 7-inch x 11 Inch

10-Piece Serving Flatware Silverware Set, Stainless Steel

Nutmeg grinder

What Goes into a Cheesy Cauliflower Casserole?

Side view of a cauliflower casserole baked in a transparent oven dish.

The ingredients for this recipe are simple and easy to swap if you need to:

A head of cauliflower: of course, this is the main ingredient but I have tried in the past to add broccoli to this casserole and it is as delicious.
Mornay sauce which is basically a cheesy bechamel: salted butter, flour and milk, these ingredients cannot be changed. Then you need cheese: here I chose a sharp cheddar cheese, the stronger white one. You can adapt with your favorite one.
Nutmeg: I believe every cheese mixture should have a little pinch of nutmeg for that hint of nutty taste.
Parmesan cheese: Again, this shredded cheese can be easily substituted by another one such as emmental, gruyère or cheddar.
Thyme: this could be optional but recommended. The addition of herb brings an elegant and fragrant touch.
Seasoning: garlic, salt and pepper.

Top view of ingredients, 2 small ramekins with cubed butter and flour, 2 bowls with grated cheese, a small pitcher of milk and a large bowl with cauliflower florets

How to Make Cheesy Cauliflower Casserole

There are 3 main steps to make, and it will be ready in a little over 30 minutes.

First, in a large pot, bring water to a boil. Cut your head of cauliflower into florets. Rinse them and put them in the boiling water. Cook for 15 minutes until tender but not fully cooked. Now, you can drain the water and set it aside.

This is a good moment to preheat the oven.

Variation: You can cook your cauliflower in broth for extra flavour!

Next, in a small pot, on medium-low, melt the butter and add the flour; stir well using a wooden spoon. This is a roux. Now, bring your heat to low and gradually add the milk. Stir constantly for 4-5 minutes or until the sauce is velvety. This is your bechamel. Pour the cheddar cheese and stir until fully combined. This is your Mornay sauce.

Lastly, let’s assemble: in a baking dish, put the florets and pour the cheesy mixture all over. Generously top with parmesan cheese and sprinkle with thyme.

Side view of white sauce poured on a bed of cauliflower florets in a transparent oven dish

Bake in the oven for 30 minutes or until the top is perfectly golden. With all the wonderful cheese in your Mornay sauce, the top browns up so lovely and easy.

Variations and Suggestions

CAULIFLOWER:

Other ways of cooking the cauliflower before pouring the Mornay sauce on top of it:

If you prefer you can steam the cauliflower instead of putting the florets in boiling water.
Or, you can make roasted cauliflower as a first step. I would suggest roasting for about 30 minutes in the oven. You might want to toss your vegetable in a large bowl with a little bit of olive oil, garlic powder, salt and pepper if you chose this cooking technique.

HINT: Poke a floret with a knife to check the tenderness of it.

Side view of cheesy cauliflower floret in a vintage spoon

TOPPINGS:

The sky is the limit. You can elevate this casserole in many ways:

Make a bed of caramelized onions before putting in your florets, it will add a little sweetness: My favorite!
Add some cubed ham in the dish before pouring the cheese sauce
Toss with some sautéed garlicky mushrooms
Toppings: Sprinkle some freshly cut green onions, bacon bits, panko crumbs for some crunch

Side view of a portion of cauliflower gratin served in a white plate with another plate in the background and a blue ramekin with cheese

What to Serve with Cheesy Cauliflower Casserole

Undoubtedly, this is a casserole dish that can be served for multiple occasions:

Make it for your next Sunday dinner with your family on the side of a Supreme steak
This also pairs deliciously with a turkey for Thanksgiving
Your Christmas ham will go hand in hand this creamy gratin

Looking for more delicious side dishes?

Stuffed and loaded baked potatoes
This cheesy Canadian bacon, swiss chard and potato gratin
Garlic Rosemary Fondant Potatoes

But remember to serve some greens on the side like this Winter citrus salad, or you can’t go wrong with a classic Caesar salad.

Lastly, no meal is complete without a nice dinner roll or slice of freshly baked bread.

Top view of an oven dish with a creamy casserole on a wooden board and 2 white plates with a portion of cauliflower in it

FAQs

Can you make this recipe ahead of time? If you want to get ahead for a big gathering, you can prepare the whole casserole without baking 24 hours before. Store it in your fridge covered with some plastic wrap.

Can you Freeze Loaded Cauliflower Casserole? Absolutely. Make sure your dish is fully cooled down before freezing it in an air-tight container.

Should I cover my casserole while baking? It is not necessary. Your cauliflower is covered in a creamy and cheesy sauce and topped with cheese; it will not dry out.

Could I use frozen cauliflower? Absolutely! If the cauliflower is pre-cooked, you might not need to steam, roast, or cook it. You might just need to blanche it (scalding the vegetable in boiling water for a short time, such as 2-3 minutes).

Can I double this recipe? For sure! Make sure to use a bigger baking dish.

Corner of a casserole of cheesy cauliflower with an antique spoon.

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