Katie Lee Broccoli Casserole Recipe: Cheesy Bake with Crunchy Topping

This cheesy broccoli casserole delivers a creamy texture with a satisfying crunch on top. The combination of tender florets and melted cheese creates a dish that’s both comforting and crowd-pleasing.

With a simple baking process and familiar ingredients, this recipe ensures restaurant-quality results at home. The golden topping adds the perfect finish to every serving.

Ingredients for Katie Lee Broccoli Casserole

Familiar ingredients transform into a restaurant-quality cheesy broccoli bake with satisfying crunch.

The cheese quality is non-negotiable here. Cabot or Tillamook sharp cheddar melts beautifully without turning grainy. Block cheese shredded at home outperforms pre-shredded (which contains anti-caking agents). For the broccoli, fresh crowns with tight florets are ideal—avoid pre-cut if possible, as it can taste bitter. The milk should be whole for optimal creaminess.

Need to swap the cheddar? Gruyère or Monterey Jack work well (use the same weight). For a lighter version, 2% milk is acceptable but reduces richness. No sour cream? Full-fat Greek yogurt at a 1:1 ratio maintains the tang. The panko can be replaced with crushed Ritz crackers for a buttery crunch. Always use vegetarian Worcestershire—Annie’s is a reliable brand.

Assemble and bake immediately for best texture. Leftovers keep 3-4 days refrigerated, though the topping softens. Reheat covered with foil at 350°F for 15-20 minutes. Freezes well for 2 months—thaw overnight before reheating.

Step-by-Step Instructions for Broccoli Casserole

This method ensures a creamy base with a perfectly crisp topping every time.

Step 1: Prepare the Vegetables and Aromatics

Bring a large pot of salted water to a boil and blanch the 6 cups Broccoli Florets for exactly 2 minutes. You want them to turn bright green and just begin to soften. Drain immediately and plunge into ice water to stop the cooking process, then drain again thoroughly.

While the broccoli cools, finely dice the 0.5 whole Yellow Onion and mince the 2 cloves Garlic Cloves. Pat the broccoli dry with paper towels—excess moisture will thin your sauce. This prep work ensures your casserole bakes evenly without becoming watery.

Step 2: Create the Cheese Sauce Base

In a saucepan over medium heat, melt 3 tbsp Unsalted Butter. Add the diced onion and cook for 4-5 minutes until translucent and sweet. Stir in the minced garlic and cook for 30 seconds until fragrant.

Whisk in the 0.25 cup All-Purpose Flour to form a roux, cooking for 1 minute until it turns a pale golden color. Slowly pour in the 1.5 cups Whole Milk, whisking constantly to prevent lumps. Cook for 3-4 minutes until the mixture thickens to coat the back of a spoon.

Step 3: Build the Custard Mixture

Remove the saucepan from heat and let cool for 2 minutes. Whisk in the 2 whole Large Eggs one at a time, then add the 0.5 cup Sour Cream, 1 tbsp Dijon Mustard, 1 tsp Worcestershire Sauce, 1 tsp Salt, and 0.5 tsp Ground Black Pepper until smooth.

Stir in 1.5 cups Sharp Cheddar Cheese until fully melted. The sauce should be thick but pourable. Taste and adjust seasoning—this is your moment to ensure the base has enough depth of flavor before baking.

Step 4: Assemble and Add the Topping

Fold the blanched broccoli into the cheese sauce until evenly coated. Transfer the mixture to a greased 9×13-inch baking dish, spreading it into an even layer. The dish should be filled about three-quarters full to allow for expansion.

Melt the remaining 1 tbsp Unsalted Butter and toss it with the 1 cup Panko Breadcrumbs and remaining 0.5 cup Sharp Cheddar Cheese. Sprinkle this mixture evenly over the casserole, pressing down lightly to adhere.

Step 5: Bake to Perfection

Bake in a preheated 375°F oven for 25-30 minutes until the topping is deep golden brown and the edges are bubbling. The center should be set with no jiggle when gently shaken.

Let rest for 10 minutes before serving. This allows the custard to set fully and makes for cleaner slices. The top should have a crisp texture that contrasts beautifully with the creamy interior beneath.

Pro Cooking Tips for Great katie lee broccoli casserole

Perfect Blanch Timing

Blanch your 6 cups Broccoli Florets for exactly 2 minutes in boiling salted water. This preserves their bright green color and crisp-tender bite. Any longer and they’ll turn mushy in the casserole. I use a large pot to avoid overcrowding. 🌟

Roux Perfection

Cook your roux of 0.25 cup All-Purpose Flour and 3 tbsp Unsalted Butter for a full 1 minute until pale golden. This removes the raw flour taste and creates a stable base for your cheese sauce. Whisk constantly to prevent burning.

Cheese Melting Strategy

Always shred your Sharp Cheddar Cheese from a block—pre-shredded contains anti-caking agents that prevent smooth melting. I recommend Cabot or Tillamook for the creamiest results. Stir the cheese into your warm (not boiling) sauce to avoid separation.

Topping Adhesion

Mix your 1 cup Panko Breadcrumbs with melted butter and remaining cheese before sprinkling. Press down lightly so the topping adheres to the casserole. This ensures every bite has that satisfying crunch. I use a 9×13-inch dish for even browning.

Resting Matters

Let your casserole rest for the full 10 minutes after baking. This allows the custard to set completely, making for cleaner slices. The topping will stay crisp while the interior firms up. Trust me, it’s worth the wait. 💪

Frequently Asked Questions