I can never resist a broccoli casserole with tender florets buried under cheddar, parmesan, garlic, and crispy toasted breadcrumbs. This is the side dish that steals attention from the main course.

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I’m obsessed with this Cheesy Garlic Broccoli Casserole because it makes broccoli the thing I actually want seconds of. The broccoli stays tender, the sharp cheddar cheese melts into every bite, and the top has that crunchy, buttery bite that keeps me sneaking forkfuls straight from the dish.

But honestly, it’s the garlicky, cheesy middle that gets me every time. Big side dish energy.

I love serving this with dinner when I want vegetables on the table, but not the sad, plain kind everyone politely ignores. And yes, I absolutely count this as a win for broccoli.

Ingredients

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Broccoli brings the green, tender bite, and makes the casserole feel slightly responsible.
Butter adds richness and helps everything taste cozy, not steamed and sad.
Garlic gives that savory kick you’ll smell before the pan even hits the table.
Onion melts into the filling and adds a little sweet, homey flavor.
Sour cream makes it tangy, creamy, and way less boring.
Mayonnaise keeps the casserole soft and rich, even after baking.
Milk loosens the sauce so it hugs the broccoli instead of clumping.
Egg helps hold everything together, basically like quiet kitchen glue.
Dijon mustard adds a tiny zing that keeps the cheese from feeling heavy.
Cheddar brings the big cheesy pull everyone’s actually here for.
Parmesan adds salty, nutty depth without trying too hard.
Breadcrumbs give the top that golden crunch.
Plus, texture matters.
Olive oil helps the topping crisp up instead of staying dry and dusty.

Ingredient Quantities

1.5 pounds fresh broccoli florets, chopped (about 4 cups)

3 tablespoons unsalted butter, divided

3 cloves garlic, minced

1 small yellow onion, finely chopped

1 cup sour cream

1/2 cup mayonnaise

1/2 cup whole milk

1 large egg, lightly beaten

1 teaspoon Dijon mustard

1 teaspoon salt

1/2 teaspoon black pepper

1 1/2 cups shredded sharp cheddar cheese, divided

1/2 cup freshly grated Parmesan cheese

3/4 cup plain breadcrumbs

1 tablespoon olive oil

How to Make this

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1. Preheat oven to 350 degrees F and butter or spray a 2 to
2.5 quart baking dish.

2. Bring a large pot of salted water to a boil, add the chopped broccoli and cook 2 minutes until bright green and just tender, then drain and rinse briefly under cold water to stop cooking; drain well and set aside.

3. In a large skillet over medium heat, melt 2 tablespoons unsalted butter, add the minced garlic and finely chopped onion, and cook 3 to 4 minutes until fragrant and the onion is translucent; remove from heat and let cool slightly.

4. In a large bowl whisk together sour cream, mayonnaise, whole milk, beaten egg, Dijon mustard, salt, and black pepper until smooth; stir in 1 cup of the shredded sharp cheddar and all of the grated Parmesan until combined.

5. Fold the blanched broccoli into the creamy cheese mixture and transfer evenly to the prepared baking dish.

6. In a small skillet, melt the remaining 1 tablespoon butter with the olive oil over medium heat, add the plain breadcrumbs and toast, stirring, until golden and crisp about 3 to 4 minutes; remove from heat and stir in the remaining 1/2 cup shredded cheddar if desired for extra cheesiness.

7. Sprinkle the toasted breadcrumb mixture evenly over the broccoli casserole.

8. Bake for 25 to 30 minutes until the casserole is bubbly and the topping is golden. If you want a darker crust, place under the broiler for 1 to 2 minutes while watching closely.

9. Let rest 5 minutes before serving so the casserole sets.

Equipment Needed

1. Oven and 2 to 2.5 quart baking dish, buttered or sprayed
2. Large pot for blanching and a colander for draining
3. Cutting board and chef knife for chopping broccoli and onion
4. Large skillet for sautéing garlic and onion
5. Small skillet for toasting breadcrumbs
6. Large mixing bowl and whisk for the creamy mixture
7. Measuring cups and spoons
8. Cheese grater for Parmesan and shredding cheddar
9. Rubber spatula or wooden spoon for folding and spreading

FAQ

Can I use frozen broccoli instead of fresh? Yes. Thaw and drain frozen broccoli well, then pat dry to remove excess moisture before using; reduce steaming time if pre-cooked to avoid a mushy casserole.

How do I make the topping extra crunchy? Toss the breadcrumbs with the tablespoon of olive oil and a pinch of salt, then spread evenly over the casserole and bake until golden; broil 1 to 2 minutes at the end if you want extra color, watching carefully.

Can I make this ahead of time? Yes. Assemble the casserole, cover, and refrigerate for up to 24 hours; add 5 to 10 minutes to the baking time if baking straight from the refrigerator.

Is there a lighter version I can make? Substitute Greek yogurt for the sour cream and use reduced fat mayonnaise and milk, but expect a slightly tangier and less rich final dish.

How do I reheat leftovers? Reheat portions in a 350 F oven for 15 to 20 minutes covered, uncovering the last few minutes to crisp the topping. Microwaving works for a quick single serving but will soften the topping.

Can I add other ingredients like protein or vegetables? Yes. Cooked diced chicken, crumbled bacon, or sautéed mushrooms fold in well; reduce added moisture from vegetables like tomatoes to keep the casserole from becoming watery.

Cheesy Garlic Broccoli Casserole Recipe Substitutions and Variations

Broccoli: swap with cauliflower florets for similar texture and flavor, or use 1.5 pounds frozen broccoli (thawed and drained) for convenience.
Sour cream: replace with plain Greek yogurt (same amount) for tang and creaminess, or use full-fat crème fraîche for richer flavor.
Egg: for a binder, use 1/4 cup mashed silken tofu or 1 tablespoon ground flaxseed mixed with 3 tablespoons water (let sit 5 minutes).
Breadcrumbs: substitute panko for extra crunch, crushed Ritz or saltine crackers for buttery flavor, or use 3/4 cup almond meal for a gluten free option.

Pro Tips

– After blanching, spread the broccoli on a clean kitchen towel or paper towels and press gently to remove excess water. Too much moisture will make the casserole runny and prevent the topping from getting crispy.

– Cook the onion and garlic until the onion is soft and lightly golden. Let that mixture cool a bit before combining with the egg and dairy so you do not scramble the egg and the flavors meld more smoothly.

– Taste and adjust seasoning before baking. The cheeses add saltiness, but a small pinch more salt or a squeeze of lemon juice can brighten the whole dish and keep it from tasting flat.

– For an extra-crisp topping, bake until the casserole is bubbling, then move the dish to a higher rack and broil for only 1 to 2 minutes while watching closely. If you prefer less pronounced browning, skip the broil and let it brown gradually.

– This casserole can be assembled ahead and refrigerated for up to 24 hours. Bring it to room temperature for 20 minutes before baking and add a few extra minutes to the cook time if baking straight from the fridge.

Cheesy Garlic Broccoli Casserole Recipe

Recipe by Toni Baldesera

0.0 from 0 votes

I can never resist a broccoli casserole with tender florets buried under cheddar, parmesan, garlic, and crispy toasted breadcrumbs. This is the side dish that steals attention from the main course.

Servings

servings

Calories

555

kcal

Equipment: 1. Oven and 2 to 2.5 quart baking dish, buttered or sprayed
2. Large pot for blanching and a colander for draining
3. Cutting board and chef knife for chopping broccoli and onion
4. Large skillet for sautéing garlic and onion
5. Small skillet for toasting breadcrumbs
6. Large mixing bowl and whisk for the creamy mixture
7. Measuring cups and spoons
8. Cheese grater for Parmesan and shredding cheddar
9. Rubber spatula or wooden spoon for folding and spreading

Ingredients

1.5 pounds fresh broccoli florets, chopped (about 4 cups)
3 tablespoons unsalted butter, divided
3 cloves garlic, minced
1 small yellow onion, finely chopped
1 cup sour cream
1/2 cup mayonnaise
1/2 cup whole milk
1 large egg, lightly beaten
1 teaspoon Dijon mustard
1 teaspoon salt
1/2 teaspoon black pepper
1 1/2 cups shredded sharp cheddar cheese, divided
1/2 cup freshly grated Parmesan cheese
3/4 cup plain breadcrumbs
1 tablespoon olive oil

Directions

Preheat oven to 350 degrees F and butter or spray a 2 to
5 quart baking dish.
Bring a large pot of salted water to a boil, add the chopped broccoli and cook 2 minutes until bright green and just tender, then drain and rinse briefly under cold water to stop cooking; drain well and set aside.
In a large skillet over medium heat, melt 2 tablespoons unsalted butter, add the minced garlic and finely chopped onion, and cook 3 to 4 minutes until fragrant and the onion is translucent; remove from heat and let cool slightly.
In a large bowl whisk together sour cream, mayonnaise, whole milk, beaten egg, Dijon mustard, salt, and black pepper until smooth; stir in 1 cup of the shredded sharp cheddar and all of the grated Parmesan until combined.
Fold the blanched broccoli into the creamy cheese mixture and transfer evenly to the prepared baking dish.
In a small skillet, melt the remaining 1 tablespoon butter with the olive oil over medium heat, add the plain breadcrumbs and toast, stirring, until golden and crisp about 3 to 4 minutes; remove from heat and stir in the remaining 1/2 cup shredded cheddar if desired for extra cheesiness.
Sprinkle the toasted breadcrumb mixture evenly over the broccoli casserole.
Bake for 25 to 30 minutes until the casserole is bubbly and the topping is golden. If you want a darker crust, place under the broiler for 1 to 2 minutes while watching closely.
Let rest 5 minutes before serving so the casserole sets.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.