Crockpot Broccoli Casserole

Get ready to love broccoli again. This dump-and-go slow cooker casserole is creamy, cheesy, and packed with tender broccoli.

Perfect for busy parents who want a real dinner without the fuss. Just toss everything in and let the crockpot work its magic.

Why This Recipe Works

• No pre-cooking needed – just dump and stir.
• Uses frozen broccoli so you can skip chopping.
• Comfort food that's actually easy to clean up.
• Kids love the cheesy, crunchy topping.

Ingredients

• 2 (12 oz) bags frozen broccoli florets, thawed and drained
• 1 can (10.5 oz) condensed cream of mushroom soup
• 1 cup sour cream
• 1 cup shredded sharp cheddar cheese, divided
• 1/2 cup mayonnaise
• 1/4 cup milk
• 1/2 tsp garlic powder
• 1/2 tsp onion powder
• 1/4 tsp black pepper
• 1 cup crushed buttery crackers (like Ritz)
• 2 tbsp unsalted butter, melted

Equipment Needed

• 6-quart slow cooker
• Mixing bowl
• Measuring cups and spoons
• Wooden spoon or spatula
• Small bowl for topping

Instructions

Prep the Broccoli

Thaw the frozen broccoli florets by placing them in a colander and running cool water over them for a minute or two. Shake off excess water and let drain well.

Pat dry with paper towels if needed – too much water will make the casserole soupy. You want the broccoli just thawed, not cooked.

Mix the Creamy Base

In a large mixing bowl, combine the cream of mushroom soup, sour cream, 3/4 cup of the shredded cheddar cheese, mayonnaise, milk, garlic powder, onion powder, and black pepper. Stir until smooth and well blended.

Taste the mixture – it should be creamy and well seasoned. This will be the sauce that coats every floret.

Combine and Transfer to Crockpot

Add the drained broccoli to the bowl with the creamy mixture. Gently fold everything together with a wooden spoon until every piece of broccoli is coated.

Transfer the mixture to a 6-quart slow cooker and spread it into an even layer. Try not to overmix or the broccoli will break apart.

Make the Crunchy Topping

In a small bowl, combine the crushed buttery crackers with the melted butter and the remaining 1/4 cup cheddar cheese. Toss until the crumbs are evenly moistened.

Sprinkle this mixture over the top of the casserole in an even layer. This will bake into a golden, crispy crust.

Slow Cook the Casserole

Cover the slow cooker with the lid and cook on low for 3 to 4 hours, or until the casserole is hot and bubbly around the edges. Check at the 3-hour mark: the internal temperature should reach at least 165°F.

The topping should be crisp and the edges lightly browned. Pro tip: if you want extra browning, remove the lid for the last 15 minutes.

Rest and Serve

Turn off the slow cooker and let the casserole rest, uncovered, for 10 minutes. This allows the sauce to thicken slightly and makes serving easier.

Scoop onto plates and enjoy while warm. Leftovers keep well in the fridge for up to 4 days.

Tips and Tricks

Don't Skip Draining the Broccoli

Frozen broccoli releases a lot of water as it thaws. If you don't drain it well, your casserole will turn out watery instead of creamy. After thawing, press the broccoli gently between paper towels to remove as much moisture as possible.

Use Full-Fat Dairy for Best Texture

Low-fat sour cream or mayo can separate in the slow cooker and make the sauce grainy. Full-fat versions give you that luscious, velvety texture. If you must lighten it up, use half the mayo and replace the rest with Greek yogurt – but expect a slightly tangier flavor.

Crisp the Topping Under the Broiler

For an extra crunchy, golden crust, transfer the cooked casserole to an oven-safe dish and broil on high for 2–3 minutes. Watch closely so it doesn't burn. This trick is perfect when you have a few extra minutes and want that oven-baked look.

Recipe Variations

• Add Protein: Stir in 2 cups of cooked, shredded chicken or diced ham for a heartier meal.
• Make It Lighter: Use Greek yogurt instead of sour cream and a low-fat cream soup. The texture will be slightly less rich.
• Swap the Cheese: Try pepper jack for a spicy kick or Gruyère for a nutty flavor.
• Add Veggies: Mix in 1 cup of frozen cauliflower or peas along with the broccoli.

Frequently Asked Questions

Can I use fresh broccoli instead of frozen?

Yes, but you'll need to blanch it first. Cut the broccoli into bite-sized florets, boil for 2 minutes, then plunge into ice water.

Drain well before adding to the casserole. Fresh broccoli will hold its shape better but requires a bit more prep time.

How do I reheat leftovers?

Reheat individual portions in the microwave on high for 1–2 minutes, or reheat the whole casserole in a 350°F oven for 15–20 minutes. If the topping has lost its crunch, add a sprinkle of fresh crushed crackers before reheating.

Can I make this ahead of time?

Absolutely. Assemble the casserole in the slow cooker insert, cover, and refrigerate for up to 24 hours.

When ready to cook, add an extra 30 minutes to the cooking time since you're starting from cold. Do not add the topping until just before cooking.

Why is my casserole watery?

Most likely, the broccoli wasn't drained well enough. Also, avoid lifting the lid during cooking – condensation drips back in and thins the sauce. If it's already watery, stir in 1 tablespoon of cornstarch mixed with 1 tablespoon of cold water and cook on high for 15 minutes.

Summary

This crockpot broccoli casserole is the ultimate busy parent dinner. Creamy, cheesy, and topped with buttery crunch, it comes together in minutes.

Dump, stir, set, and forget – then enjoy a comforting meal the whole family will love. Weeknight winner!

Crockpot Broccoli Casserole

Servings

4

servings

Prep time

30

minutes

Cooking time

40

minutes

Total time

1

hour 

10

minutes

Ingredients

• 2 (12 oz) bags frozen broccoli florets, thawed and drained

• 1 can (10.5 oz) condensed cream of mushroom soup

• 1 cup sour cream

• 1 cup shredded sharp cheddar cheese, divided

• 1/2 cup mayonnaise

• 1/4 cup milk

• 1/2 tsp garlic powder

• 1/2 tsp onion powder

• 1/4 tsp black pepper

• 1 cup crushed buttery crackers (like Ritz)

• 2 tbsp unsalted butter, melted

Directions

• Thaw frozen broccoli in a colander under cool water, then drain and pat dry.
• In a large bowl, mix cream of mushroom soup, sour cream, 3/4 cup cheddar, mayonnaise, milk, garlic powder, onion powder, and pepper until smooth.
• Add broccoli to the bowl and fold gently to coat. Transfer to a 6-qt slow cooker and spread evenly.
• In a small bowl, combine crushed crackers, melted butter, and remaining 1/4 cup cheddar. Sprinkle over casserole.
• Cover and cook on low for 3-4 hours, until hot and bubbly (internal temp 165°F). For extra browning, remove lid last 15 minutes.
• Turn off slow cooker, let rest uncovered 10 minutes, then serve.