Slow Cooker Baked Broccoli & Cheese Casserole — Creamy, Easy & Crowd-Pleasing
Meta title: Slow Cooker Baked Broccoli and Cheese Casserole | Easy Comfort Side Dish
Meta description: Make a creamy, hands-off Slow Cooker Baked Broccoli & Cheese Casserole with a golden breadcrumb topping. Step-by-step recipe, tips, make-ahead instructions, and tasty variations.
A rich, melty broccoli-and-cheese casserole that practically makes itself — slow cooker does the gentle cooking, then a quick broil gives you a golden, crispy top. Perfect as a comforting side for weeknights, holiday tables, or as a make-ahead potluck dish.
Quick facts
Prep: 10 minutes
Slow-cook time: 3–4 hours (LOW)
Broil time: 3–5 minutes
Total time: ~3 hr 20 min – 4 hr 15 min
Servings: 4–6
Ingredients
(Using the quantities you gave — metric approximations are noted below.)
4 cups broccoli florets
2 cups shredded cheddar cheese
1 cup milk
1/2 cup heavy cream
1/4 cup grated Parmesan cheese
1/4 cup breadcrumbs
1/4 cup chopped fresh parsley
1/4 cup chopped green onions (scallions)
2 tablespoons unsalted butter
1 teaspoon garlic powder
Salt and pepper, to taste
Metric approximations (approx.): 4 cups broccoli ≈ 364 g, 2 cups cheddar ≈ 226 g, 1 cup milk ≈ 240 ml, 1/2 cup cream ≈ 120 ml, 1/4 cup Parmesan ≈ 25 g, 1/4 cup breadcrumbs ≈ 30 g, 2 tbsp butter ≈ 28 g.
Equipment
Slow cooker (4–6 quart / 3.8–5.7 L recommended)
Medium saucepan
Oven-safe baking dish (for broiling)
Whisk or wooden spoon
Cheese grater (if shredding fresh)
Step-by-step directions (detailed)
Prep & grease (5 minutes). Lightly grease the inside of your slow cooker with butter or nonstick spray so the casserole releases easily later. Wash and trim broccoli into bite-size florets.
Layer the broccoli (1–2 minutes). Place the broccoli florets in an even layer inside the slow cooker.
Make the cheese sauce (7–10 minutes).
In a medium saucepan over medium heat, melt the 2 tbsp butter.
Stir in the milk, heavy cream, and 1 tsp garlic powder. Warm the liquid until it’s just steaming — don’t let it boil.
Reduce heat to low and gradually add the shredded cheddar, stirring constantly until the sauce is smooth and velvety. Remove from heat and season lightly with salt and pepper. Tip: If using pre-shredded cheese, it can be slightly drier — freshly shredded cheddars melt best.
Combine in slow cooker (1 minute). Pour the warm cheese sauce over the broccoli in the slow cooker and stir gently to coat evenly.
Slow-cook (3–4 hours on LOW). Cover and cook on LOW for 3–4 hours. The broccoli should be tender but not mushy — aim for fork-tender. Check at 3 hours; if you prefer firmer florets, remove earlier.
Preheat broiler & transfer (5 minutes). When the broccoli is done, preheat your oven’s broiler. Carefully transfer the broccoli + cheese mixture to an oven-safe dish. Smooth the top.
Top & broil (3–5 minutes). Evenly sprinkle the 1/4 cup Parmesan and 1/4 cup breadcrumbs over the casserole. Broil on high for 3–5 minutes, watching closely until the top is golden brown and crispy. (Broilers vary—don’t walk away.)
Garnish & serve (1 minute). Remove from oven, garnish with chopped parsley and green onions. Serve hot.
Pro tips & troubleshooting
Avoid mushy broccoli: Use firm florets, don’t overcook in the slow cooker, and check at the 3-hour mark. Larger florets hold texture better than tiny pieces.
Sauce too thin? Make a cornstarch slurry (1 tsp cornstarch + 1 tbsp cold water) and whisk into the warm cheese sauce briefly on the stovetop before pouring over broccoli. Or cook sauce a little longer to reduce it before adding cheese.
Cheese separates or grainy? Melt cheese slowly over low heat; avoid boiling. Freshly shredded cheese (not pre-shredded) melts smoother. Adding a tablespoon of cream cheese to the sauce can also stabilize it.
No slow cooker? You can assemble everything and bake at 180°C / 350°F for 20–25 minutes covered, then broil 3–5 minutes to brown.
Variations
Spicy kick: Add a pinch of cayenne or 1–2 dashes of hot sauce to the cheese sauce.
Cheese swap: Use Gruyère, Monterey Jack, or a mix of cheddar + Gruyère for nuttier flavor.
Gluten-free: Replace breadcrumbs with crushed gluten-free crackers or omit and top with toasted almond flour.
Protein boost: Fold in cooked shredded chicken, diced ham, or crumbled bacon before broiling.
Vegan option: Use unsweetened plant milk + full-fat coconut cream or cashew cream, vegan cheddar, and gluten-free panko.
Make-ahead, storage & reheating
Make-ahead: Assemble and slow-cook, then refrigerate without broiling for up to 24 hours. When ready, top with crumbs & Parmesan and broil.
Refrigerate: Store leftovers in an airtight container for 3–4 days.
Freeze: Freeze before broiling for best texture — place in a freezer-safe dish, freeze up to 2 months. Thaw overnight in fridge, then broil to finish.
Reheat: Warm in a 175°C / 350°F oven covered for 15–20 minutes, then broil briefly to re-crisp the top. Microwaving works for single servings but won’t keep the crust crisp.
Serving suggestions
Pairs beautifully with roasted or grilled chicken, baked ham, mashed potatoes, rice pilaf, or a crisp green salad. It also works as a hearty vegetarian main served with crusty bread.