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Baked Cauliflower Casserole

Baked cauliflower casserole is so easy to make as a quick side dish for almost any dinner recipe.

Fresh cauliflower is combined with diced tomatoes and herbs. Topped with cheese and breadcrumbs for an easy and delicious recipe that’s baked in the oven. Pair this with your favorite chicken recipe, beef, marinated pork or fish.

Baked cauliflower casserole recipe in a white square dish with a spoon in the bottom corner.

An Easy Veggie Side Dish

Today’s recipe is the perfect healthy addition to any main dish on the table.

  • Cauliflower is a budget-friendly vegetable that welcomes other flavors easily. In today’s recipe it’s combined with diced tomatoes, fresh herbs, cheese and breadcrumbs. The result is a simple and delicious savory dish with herb-infused flavor.
  • Cauliflower bakes beautifully in the oven. In this recipe, the cauliflower first needs to be roasted alone for 20 minutes, then it’s combined with other ingredients in the casserole dish to bake again.
  • Frozen cauliflower can be used in this recipe. I would still recommend baking for 20 minutes before adding it to the casserole. This will give it time to thaw.
  • I love this vegetable for it’s versatility! Regularly I pick up a head of cauliflower to use for cauliflower rice, to make a low carb pizza crust, in the air fryer with buffalo bites, and for my favorite lunch recipe, creamy pureed cauliflower soup.
Recipe ingredients on the counter including a bowl of chopped cauliflower, canned diced tomatoes, shredded cheese, onion, breadcrumbs and herbs.

Recipe Ingredients

CAULIFLOWER: This recipe uses one full head of cauliflower. Look for one with a fresh green base and little to no dark spots on the cauliflower surface.

FILLING: This recipe is kept simple with a small amount of onion, canned diced tomatoes, Italian seasoning, salt and pepper.

TOPPING: Shredded cheddar cheese is combined with breadcrumbs to create a simple topping. Feel free to use any style of cheese for this recipe.

Four images showing steps to make the recipe. First is sliced cauliflower on a baking sheet. Second is bowl of tomatoes, onions and herbs. Third is bowl of cauliflower, tomatoes and herbs. Four is cauliflower tomato herb mixture in a square white dish.

How To Make Baked Cauliflower Casserole

To prepare the cauliflower, slice off the thick stem base and remove all the green leaves. Give it a good rinse under cool water, then pat dry thoroughly. Slice off any dark spots on any of the cauliflower. Then break apart (or slice) into smaller bite-size florets.

  1. Bake the cauliflower alone for 20 minutes according to the full recipe instructions below.
  2. Mix tomatoes, onion, and spices together. Add in the baked cauliflower.
  3. Pour into a greased square casserole dish. Top with cheese and breadcrumbs.
  4. Bake until edges turn golden brown. Let cool, serve and enjoy!
Close up of baked cheese and  breadcrumbs overtop of cauliflower and tomatoes inside a white square casserole dish.

Recipe Tips

  • Slice the cauliflower into smaller florets. If they’re too big, they will take longer to cook.
  • Strain the canned tomatoes thoroughly before using them. Any leftover juices will be at the bottom of the casserole dish.
  • Substitute breadcrumbs with gluten-free versions or leave them out completely if you want to make this recipe low carb.
  • Baking the cauliflower first allows it to cook and soften. If you avoid this step you will end up with raw cauliflower inside the baked casserole.
Large casserole dish with spoon beside small white bowl, both with recipe inside them.

More Side Dish Ideas

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Baked Cauliflower Casserole

Fresh cauliflower is combined with diced tomatoes and herbs. Topped with cheese and breadcrumbs for an easy and delicious recipe that's baked in the oven.
Print Pin Recipe
Prep Time: 10 minutes
Cook Time: 40 minutes
Total Time: 50 minutes
Servings: 6 servings

Ingredients

Instructions

  • Preheat the oven to 400°F.
  • Wash and chop the cauliflower into small florets. Pat dry throroughly with a towel.
    Two images, first is cauliflower florets on a cutting board with a knife. Second is florets in a bowl.
  • Place onto a baking sheet lined with parchment paper. Spray with cooking spray and season with salt and pepper. Bake for 20 minutes. Remove from oven but keep the temperature on.
    Before and after photos of cauliflower florets on baking sheet raw then cooked.
  • Spray a square baking dish with nonstick cooking spray.
    White square dish with nonstick cooking spray beside it.
  • Drain the canned diced tomatoes thoroughly from all juices.
    Diced tomatoes in a strainer.
  • Add diced tomatoes to a large bowl along with onion, italian seasoning, salt and pepper. Mix together.
    Two images of A white bowl with diced tomatoes, chopped onion, and spices. First unmixed, second is mixed.
  • Add in the cooked cauliflower and mix again.
    Two images of a white bowl, first is cauliflower florets and diced tomatoes. Second is ingredients mixed together in bowl and a spatula.
  • In a separate bowl, combine the grated cheese and breadcrumbs.
    Two images of a white bowl: first with shredded cheese and breadcrumbs. Second is ingredients mixed together and small spatula.
  • Scoop the tomato cauliflower mixture into the greased square dish. Spread into an even single layer. Sprinkle the cheese and breadcrumbs on top.
    Two images of a white square dish: first with cauliflower tomato mixture spread in. Second with grated cheese and breadcrumbs sprinkled on top.
  • Bake for 20 minutes, then let cool 10 minutes. Scoop on to plates, serve and enjoy!
    Baked cheese cauliflower casserole in square dish with serving scooped out into a white bowl.

Recipe Notes:

  • Slice the cauliflower into smaller florets. If they’re too big, they will take longer to cook.
  • Strain the canned tomatoes thoroughly before using them. Any leftover juices will be at the bottom of the casserole dish.
  • Substitute breadcrumbs with gluten-free versions or leave them out completely if you want to make this recipe low carb.
  • Baking the cauliflower first allows it to cook and soften. If you avoid this step you will end up with raw cauliflower inside the baked casserole.
Nutrition
Calories: 135kcal | Carbohydrates: 16g | Protein: 7g | Fat: 6g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Cholesterol: 14mg | Sodium: 388mg | Potassium: 457mg | Fiber: 3g | Sugar: 4g | Vitamin A: 224IU | Vitamin C: 53mg | Calcium: 170mg | Iron: 2mg

Please note these nutritional values provided above are just an estimate. Actual numbers will vary based on brands and ingredients you choose, and your preferred portion sizes.

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