Chicken Broccoli Casserole with Cheddar Crumb Topping

• A two-minute blanch starts the broccoli without cooking it through. Cooling and drying the florets stops carryover cooking and prevents water from loosening the sauce.
• Cheese goes into warm sauce off the heat. Lower temperature helps it melt smoothly instead of separating into oil and grainy solids.
• Cracker crumbs sit above a thin cheddar layer. That barrier keeps the crumbs crisp while tying the topping to the creamy filling underneath. Loose peaks also brown more evenly.

Ingredient notes

• Broccoli: Cut florets to roughly 1 1/2 inches so they finish together. Peel and dice the tender stem rather than discarding it; the small pieces add texture without crowding the dish. Match pieces by stem thickness for even cooking.
• Cooked chicken: Tear the meat into broad bites. Fine shreds absorb too much sauce and disappear, while pieces around 1 inch remain recognizable after reheating.
• Cheddar: Use sharp cheddar and grate it from a block. Pre-shredded cheese carries coatings that can keep a scratch sauce from becoming completely smooth.
• Milk and stock: The combination makes a sauce that is creamy but not heavy. Add both gradually to the flour base, smoothing each addition before the next.
• Crackers: Buttery round crackers crush into irregular flakes that brown well. Leave some larger crumbs for texture instead of reducing everything to powder. Measure after crushing so the topping remains light rather than dense.

1. 1Blanch and dry the broccoli

   Heat the oven to 375°F (190°C). Bring a wide pot of water to a boil. Add the broccoli and cook for 2 minutes, until brighter green but still firm at the stem. Drain immediately, rinse under cold water, and spread on a clean towel. Pat the surfaces dry; visible droplets will thin the finished casserole.

   

2. 2Make a smooth cheddar sauce

   Melt 42 g butter in a saucepan over medium heat. Add the onion and cook for 4 minutes. Stir in flour, garlic powder, salt, and pepper for 1 minute. Whisk in stock, then milk, in gradual additions. Simmer for 3 minutes until the sauce coats a spoon. Remove from heat and stir in Dijon plus 170 g cheddar until smooth.

3. 3Fold and top the casserole

   Combine the dry broccoli, chicken, and sauce in a lightly buttered 9-by-13-inch dish. Fold gently so the florets stay intact, then level the surface. Scatter over the remaining cheddar. Mix cracker crumbs with 28 g melted butter and distribute them loosely across the cheese; do not press them into the sauce.

   

4. 4Bake until the edges bubble

   Bake uncovered for 22 to 25 minutes, until the perimeter bubbles and the crumb peaks are golden brown. The center should look creamy rather than watery when a spoon parts the topping. Rest for 10 minutes before serving. This pause lets the sauce settle while the uncovered crumbs remain crisp. Divide into 6 portions with a wide spoon, reaching beneath the broccoli.

• Cut florets by stem thickness, not crown width. Similar stems reach the same tenderness during the short blanch and bake.
• Dry the broccoli on a towel. A colander removes runoff but leaves enough surface water to weaken the cheese sauce.
• Take the saucepan off the burner before adding cheddar. Gentle residual heat melts it without encouraging separation.
• Leave the crumbs loose and irregular. Packed crumbs form a hard sheet that pulls away from the serving below.
• Bake uncovered from start to finish. The filling is already warm, so foil would only soften the cracker topping before it can brown fully.

Serve the casserole with a crisp apple salad or roasted tomatoes to balance the cheddar sauce. Six portions work as a complete dinner with bread for wiping the plate. For smaller appetites, divide it into 8 servings and add baked potatoes. Keep any extra cracker crumbs at the table rather than mixing them into leftover portions before refrigeration. A little lemon is welcome.