Creamy French Onion Broccoli Cheese Casserole

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When comfort food calls, there’s nothing quite like a creamy, cheesy casserole packed with vegetables and flavor. This Creamy French Onion Broccoli Cheese Casserole is a dreamy side dish or cozy vegetarian main that layers fresh broccoli, rich cheese sauce, and a caramelized onion twist that takes it over the top.

Each bite delivers cheesy goodness balanced with the subtle sweetness of French onion. It’s the kind of dish that feels fancy enough for the holidays, yet simple enough for a weeknight dinner. Whether you’re feeding a crowd or making a comforting dinner for your family, this recipe promises to be a hit.

Why You’ll Love This Creamy French Onion Broccoli Cheese Casserole

This casserole isn’t just creamy and indulgent—it’s also packed with bold savory flavors. The French onion soup base infuses the dish with depth, while the broccoli adds freshness and texture. You get that bubbly, golden cheese top layer with every forkful. Plus, it’s versatile: serve it as a holiday side or as a meatless meal all on its own.

What Kind of Cheese Works Best for Broccoli Casserole?

While cheddar is the classic choice for broccoli casseroles, we go one step further with a blend of sharp cheddar and mozzarella. Cheddar adds richness and tang, while mozzarella brings that ooey-gooey stretch everyone loves. If you like a smoky flavor, you can also toss in a handful of smoked gouda.

Ingredients for the Creamy French Onion Broccoli Cheese Casserole

For this comforting dish, each ingredient brings balance and heartiness. The creamy sauce, savory onions, and sharp cheeses combine to transform simple broccoli into something special.

• Broccoli florets
• Butter
• Yellow onions
• French onion soup (condensed)
• Cream cheese
• Shredded sharp cheddar cheese
• Shredded mozzarella cheese
• Sour cream
• Garlic powder
• Salt and pepper
• Panko breadcrumbs

How To Make the Creamy French Onion Broccoli Cheese Casserole

Step 1: Sauté the Onions

Melt butter in a large skillet over medium heat and cook the sliced yellow onions until they become soft and caramelized, about 15 minutes. Stir often so they don’t burn.

Step 2: Prepare the Broccoli

While the onions cook, steam the broccoli florets until just tender. You want them slightly firm so they don’t get mushy during baking.

Step 3: Create the Creamy Sauce

Once the onions are golden and fragrant, stir in the condensed French onion soup and cream cheese. Cook until the cheese is melted and the mixture is smooth. Add garlic powder, salt, and pepper to taste.

Step 4: Combine Everything

In a large mixing bowl, combine the steamed broccoli, creamy onion mixture, sour cream, half of the cheddar and mozzarella, and mix well.

Step 5: Assemble the Casserole

Spread the mixture into a greased baking dish. Top with the remaining cheese and sprinkle panko breadcrumbs over the top.

Step 6: Bake to Golden Perfection

Bake in a preheated oven at 375°F for about 25 minutes or until the top is bubbly and golden brown.

Serving and Storing Your Casserole Creation

This dish makes about 6 generous servings, but can easily be doubled for larger crowds. Serve it hot right out of the oven while the cheese is melty and the top is crisp. If you’re planning ahead, it reheats beautifully in the oven or microwave the next day. Store leftovers in an airtight container in the fridge for up to 4 days.

What to Serve With Creamy French Onion Broccoli Cheese Casserole?

Garlic Bread

Perfect for scooping up every last bit of creamy sauce.

Baked Chicken Thighs

A juicy protein option that complements the rich, cheesy broccoli.

Lemon Herb Quinoa

Adds a light, zesty contrast to the casserole’s bold flavors.

Roasted Carrots

Their natural sweetness pairs well with the savory cheese.

Cranberry Walnut Salad

A crisp and tangy salad offers a refreshing balance.

Stuffed Bell Peppers

Adds texture and color to your plate alongside the casserole.

Creamy Tomato Basil Soup

Pair this casserole with a warm bowl of tomato soup for ultimate cozy vibes.

Want More Casserole Ideas?

If you love this Creamy French Onion Broccoli Cheese Casserole, you’ll probably enjoy these other favorites:

• Cheesy Baked Tortellini with Meat Sauce
• Creamy Beef and Shells Recipe
• Creamy Ground Beef Alfredo Pasta
• Mushroom Mozzarella Bake
• Stovetop Creamy Ground Beef Pasta

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And let me know in the comments how yours turned out. Did you use fresh or frozen broccoli? Did you switch up the cheeses?

I love hearing how others make these recipes their own. Questions are welcome too—let’s help each other cook smarter.

Explore beautifully curated health-boosting dishes on Mia Recipes on Pinterest and discover your next favorite comfort food with a twist!

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