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Creamy Broccoli Cheddar Casserole

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Total Time: 1 hour 15 minutes
Active Prep Time: 25 minutes (Medium Intensity)
Cook Time: 50 minutes (Mostly Hands-Off)
Serves: 8
Difficulty: Easy to Medium

A Cozy Classic, Perfected

This Ultimate Creamy Broccoli Cheddar Casserole is the comforting side dish of your dreams, transformed into a hearty, standalone meal. We go beyond the classic by building a rich, homemade cheese sauce from the ground up and using a savory panko topping for the perfect crunch. It’s the perfect centerpiece for a holiday table, a potluck champion, or a satisfying weeknight dinner that the whole family will love. Loaded with fresh broccoli and enveloped in a luxuriously creamy sauce, this recipe promises a perfect bite every time.

Nutritional Information (Per Serving):

  • Calories: ~480

  • Total Fat: 32g

  • Saturated Fat: 18g

  • Cholesterol: 95mg

  • Sodium: 720mg

  • Total Carbohydrates: 28g

  • Dietary Fiber: 3g

  • Sugars: 6g

  • Protein: 22g

Nutritional information is an estimate and may vary based on specific ingredients used.

Ingredients

For the Casserole:

  • 2 large heads of broccoli, cut into small florets (about 1.5 lbs or 7 cups)

  • 3 tablespoons unsalted butter

  • 1 medium yellow onion, finely diced

  • 4 cloves garlic, minced

  • 3 tablespoons all-purpose flour

  • 2 cups whole milk, warmed slightly

  • 1 cup chicken or vegetable broth

  • 1 teaspoon Dijon mustard

  • ½ teaspoon smoked paprika

  • ¼ teaspoon ground nutmeg

  • 1 teaspoon kosher salt

  • ½ teaspoon freshly ground black pepper

  • 8 ounces (2 cups) sharp cheddar cheese, shredded (divided)

  • 4 ounces (1 cup) Gruyère cheese, shredded

  • 1 cup full-fat sour cream

For the Panko Topping:

  • 1 ½ cups panko breadcrumbs

  • 3 tablespoons unsalted butter, melted

  • ¼ cup freshly grated Parmesan cheese

  • 2 tablespoons fresh parsley, finely chopped

  • ¼ teaspoon garlic powder

Equipment

  • Large pot for blanching

  • Large skillet or Dutch oven

  • Whisk

  • 9×13 inch baking dish

  • Mixing bowls

Instructions

1. Prep & Blanch the Broccoli (15 minutes)

  • Preheat your oven to 375°F (190°C). Grease your 9×13 baking dish.

  • Bring a large pot of salted water to a rolling boil. Prepare a large bowl of ice water.

  • Add the broccoli florets to the boiling water and blanch for 2 minutes exactly. You want them bright green and just tender-crisp.

  • Immediately drain the broccoli and plunge it into the ice water to stop the cooking. Drain again thoroughly and set aside. This step preserves color and perfect texture.

2. Build the Luxurious Cheese Sauce (20 minutes – Medium Intensity)

  • In your large skillet or Dutch oven, melt the 3 tablespoons of butter over medium heat. Add the diced onion and cook until soft and translucent, about 5-7 minutes.

  • Add the minced garlic and cook for another minute until fragrant.

  • Sprinkle the flour over the onions and garlic. Cook, stirring constantly, for 2 minutes to form a roux and cook out the raw flour taste.

  • Gradually whisk in the warm milk and broth, ensuring no lumps remain. Continue to whisk until the mixture is smooth and begins to thicken, about 5-7 minutes.

  • Whisk in the Dijon mustard, smoked paprika, nutmeg, salt, and pepper.

  • Reduce heat to low. Gradually add 1 ½ cups of the shredded cheddar and all of the Gruyère cheese, stirring until completely melted and smooth. Remove from heat.

  • Stir in the sour cream until fully incorporated. Taste and adjust seasoning if needed.

3. Assemble the Casserole (5 minutes)

  • Add the well-drained blanched broccoli to the cheese sauce. Gently fold until every floret is beautifully coated.

  • Pour the entire mixture into your prepared baking dish and spread it into an even layer.

  • Sprinkle the remaining ½ cup of shredded cheddar cheese evenly over the top.

4. Create the Crispy Topping & Bake (5 min prep + 50 min bake)

  • In a medium bowl, combine the panko breadcrumbs, melted butter, Parmesan cheese, parsley, and garlic powder. Mix until the panko is evenly moistened.

  • Sprinkle the panko mixture evenly over the top of the casserole.

  • Place the baking dish on a sheet pan (to catch any potential bubbly overflow) and bake, uncovered, for 45-55 minutes. The casserole should be bubbling vigorously around the edges, and the topping should be a deep, golden brown.

5. The Crucial Rest (10 minutes)

  • This step is non-negotiable for the perfect slice! Remove the casserole from the oven and let it rest on a cooling rack for at least 10 minutes before serving. This allows the sauce to thicken slightly and set, ensuring you get clean, beautiful servings rather than a runny spoonful.

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