This Roasted Broccoli Casserole is a dependable favorite on our Thanksgiving and Christmas table. It’s simple to prepare, comforting, and a great way to turn broccoli into something everyone looks forward to. Make it part of your holiday tradition or bring it to any potluck where a rich, satisfying side is welcome.

Roasted Broccoli Casserole Recipe

This casserole is one of my go-to side dishes for holidays and gatherings. I make it for Easter, Christmas, Thanksgiving, and any time I need a crowd-pleasing vegetable side. It’s straightforward to assemble, and if you appreciate broccoli even a little, you’ll love how the roasting and creamy cheese sauce elevate it.

For the best flavor, roast the broccoli before baking the casserole. Toss the florets with a little olive oil and a pinch of salt and pepper, then roast in a 375°F oven (or on a pellet grill) just until the tops begin to brown—about 8–10 minutes. That light roasting adds a toasty depth that shines through the creamy sauce.

Why you’ll love it!

Creamy, cheesy broccoli with a golden, crunchy topping.
Transforms humble broccoli into a standout side dish.
Quick and easy to prepare, even for a busy holiday kitchen.
Travels well—great for potlucks or bringing to a family meal.

Get all of our Broccoli Recipes here!

Recipe Shopping List

Wondering what to buy? Here’s everything you’ll need to make this casserole. For exact quantities and the full printable recipe, see the recipe details below.

Fresh broccoli florets
Olive oil
Salted butter
Onion
All-purpose flour
Whole milk
Dry mustard
Garlic powder
Salt and pepper
Shredded cheddar jack cheese
Ritz crackers (or similar buttery crackers)

Try our Traeger Broccoli Chicken Divan too!

How To Make This Recipe

Below is a clear overview of the steps so you know what to expect. Use the full ingredient list and exact measurements in the recipe card further down when you cook.

Preheat: Heat the oven or pellet grill to 375°F.
Roast: Spread the broccoli on a baking sheet, drizzle with olive oil, and roast until the tips begin to brown. This takes about 7–10 minutes. After roasting, lower the oven temperature to 325°F before baking the assembled casserole.
Make the sauce: In a saucepan, melt butter and sauté diced onion until soft. Whisk in flour and cook briefly, then gradually whisk in milk, dry mustard, garlic powder, and salt. Simmer over medium-low until the sauce thickens, then stir in 1 cup of shredded cheese until smooth.
Assemble: Put the roasted broccoli in a deep baking dish, pour the cheese sauce over it, and sprinkle the remaining cheese on top. Mix crushed crackers with melted butter and scatter over the cheese layer.
Bake & Serve: Bake at 325°F for 30–35 minutes, or until the casserole is bubbly and the cracker topping is toasted. Serve hot.

How about some Chicken Broccoli Stir Fry?

Serve this with…

Smoked Prime Rib
Double-Smoked Ham
Spatchcock Turkey

More Holiday Recipes To Love

Here are a few more recipes that pair nicely with this casserole and help round out a holiday meal. From rolls to mashed potatoes and a classic coleslaw, these dishes are holiday staples.

Milk Rolls
Roasted Garlic Mashed Potatoes
Better Than KFC Coleslaw

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Yield: 8 people

Roasted Broccoli Casserole

This roasted broccoli casserole is a holiday favorite—broccoli coated in a silky cheese sauce, finished with a crisp, buttery cracker topping. It’s rich and comforting, and a great way to get extra veg on the table without skimping on flavor.

Prep Time:
20 minutes

Cook Time:
25 minutes

Total Time:
45 minutes

Ingredients

5–6 cups fresh broccoli florets
2 tablespoons olive oil
½ cup salted butter
¼ cup diced onion
⅓ cup all-purpose flour
3 cups whole milk
½ teaspoon dry mustard
¼ teaspoon garlic powder
½ teaspoon salt, or more to taste
3–4 cups shredded cheddar jack cheese
10–15 Ritz crackers, crushed
3 tablespoons butter, melted (for topping)

Instructions

Preheat the oven to 375°F. Spread the broccoli on a large baking sheet, drizzle with olive oil, and roast for 7–10 minutes until small brown spots appear. You want some roast flavor, not fully cooked florets.
In a medium sauté pan, melt ½ cup butter over medium-low heat. Add the diced onion and cook 4–5 minutes until softened. Whisk in the flour and lower the heat; cook 3–5 minutes, stirring frequently to eliminate the raw flour taste.
Gradually whisk in the milk, then add dry mustard, garlic powder, and salt. Cook over medium-low heat until the sauce thickens. Remove from heat and stir in 1 cup of shredded cheese until smooth.
Place the roasted broccoli in a large baking dish, pour the cheese sauce over it, and sprinkle the remaining cheese evenly on top.
Mix the crushed crackers with the 3 tablespoons melted butter and scatter the mixture over the cheese. Reduce oven temperature to 325°F and bake 30–35 minutes, until bubbly and the topping is golden. Serve hot.

Nutrition Information

Yield: 15 servings
Serving Size: 1
Amount per serving:
Calories: 631
Total Fat: 45g
Saturated Fat: 24g
Trans Fat: 1g
Unsaturated Fat: 16g
Cholesterol: 119mg
Sodium: 918mg
Carbohydrates: 32g
Fiber: 11g
Sugar: 8g
Protein: 31g