Ground Beef Zucchini Casserole Recipe

If you love wholesome comfort food that doesn’t skimp on flavor—or vegetables—then this Ground Beef Zucchini Casserole is about to become your new weeknight hero. It’s a hearty, cheesy, crave-worthy bake that unites savory ground beef, fresh zucchini, tangy tomatoes, and a duo of cheeses in every bite. Not only is it easy enough for busy evenings, but its layers of flavor and texture mean the whole family will be reaching for seconds. Whether you’re looking for a way to use up garden zucchini or searching for a cozy dinner that’s secretly loaded with veggies, this crowd-pleaser absolutely delivers.

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Ingredients You’ll Need

The beauty of this Ground Beef Zucchini Casserole lies in its simple, familiar ingredients that come together to create something unforgettable. Each one plays a vital role—whether it’s adding creaminess, zestiness, or that satisfying golden crunch on top.

• Olive oil: Gives richness and helps brown the beef and veggies for extra flavor.
• Ground beef: The star protein, offering heartiness and savory goodness in every bite.
• Onion: Adds depth and subtle sweetness as it softens in the skillet.
• Garlic: Infuses the casserole with aromatic notes that tie everything together.
• Zucchinis: Fresh, tender, and a vibrant way to add moisture and color that’s never soggy.
• Diced tomatoes (drained): Lend juiciness and a subtle tang that brightens the rich flavors.
• Shredded cheddar cheese: Provides the melty, cheesy layer everyone craves.
• Sour cream: Adds creaminess and a subtle tang to enrich the dish.
• Dried basil and oregano: These herbs add classic Italian flair and wonderful aroma.
• Salt and black pepper: Essential for boosting every other flavor here.
• Grated Parmesan cheese: For that irresistible salty-savory finish on top.
• Breadcrumbs (optional): Brings a golden, crunchy topping if you love a bit of texture.
• Butter (melted, if using breadcrumbs): Ensures the breadcrumbs turn perfectly toasted and flavorful.

How to Make Ground Beef Zucchini Casserole

Step 1: Preheat Your Oven

Before you start chopping or browning, set your oven to 375°F (190°C). This way, it’ll be ripping hot and ready for your casserole by the time you assemble everything, ensuring that golden, bubbly top we all adore.

Step 2: Brown the Beef

In a large skillet, heat the olive oil over medium heat. Add the ground beef, breaking it up as it cooks. Let it brown deeply—those little crispy bits unlock major flavor! Once cooked through, drain off any excess fat so your casserole isn’t greasy.

Step 3: Sauté the Aromatics

With the beef still in the pan, toss in the diced onion and minced garlic. Sauté for 2 to 3 minutes until the onion is soft and fragrant. This quick step lays a delicious foundation for the rest of the ingredients to shine.

Step 4: Add the Zucchini

Stir in the zucchini half-moons, mixing well with the beef and onions. Cook for another 5 to 7 minutes—just long enough for the zucchini to turn beautifully tender while still holding its shape and some bite.

Step 5: Bring in the Creamy, Cheesy Goodness

Add the drained diced tomatoes, shredded cheddar cheese, sour cream, dried basil, dried oregano, salt, and black pepper. Stir everything together until the mixture is creamy, cheesy, and studded with colorful vegetables. This blend is the heart of your Ground Beef Zucchini Casserole.

Step 6: Assemble and Top

Transfer the hearty mixture into a greased 9×13-inch baking dish, spreading it evenly. Sprinkle the grated Parmesan cheese over the top for that intense flavor punch. If you love a crispy top, mix your breadcrumbs with melted butter and shower them over the Parmesan layer.

Step 7: Bake to Perfection

Bake the casserole uncovered for 20 to 25 minutes, or until it’s bubbling and gloriously golden on top. Let it rest for 5 minutes once out of the oven—just enough time for the cheese to set and flavors to meld before you dive in.

How to Serve Ground Beef Zucchini Casserole

Garnishes

Add a flourish of freshness by showering your finished casserole with chopped fresh herbs like parsley, basil, or chives right before serving. A dollop of extra sour cream is always a welcome touch to cool down each rich, cheesy forkful.

Side Dishes

Pair your Ground Beef Zucchini Casserole with a crisp green salad tossed in a bright vinaigrette to balance its hearty warmth. Garlic bread, roasted potatoes, or even steamed rice can turn this casserole into a comfort-food feast that feels both classic and satisfying.

Creative Ways to Present

If you want to change things up for a party (or just for fun), bake the mixture in individual ramekins for personal-sized servings. Or use vibrant, oven-safe dishes to add color to your table—this makes each portion feel extra special for guests.

Make Ahead and Storage

Storing Leftovers

Leftover Ground Beef Zucchini Casserole keeps beautifully in the refrigerator. Just transfer the completely cooled casserole to an airtight container, or cover the baking dish snugly with foil. It stays fresh for up to 4 days, making it a perfect lunch or quick dinner solution later in the week.

Freezing

If you want to freeze for later, let the casserole cool completely. Wrap it tightly in foil or portion out into freezer-safe containers. It’ll stay tasty in the freezer for up to 2 months. Thaw overnight in the fridge before reheating for best results.

Reheating

To reheat, cover the casserole with foil and warm it in a 350°F oven until heated through—usually about 20 minutes. For single servings, the microwave works well (start with 1 to 2 minutes). If you want the topping crisp, uncover for the last few minutes in the oven.

FAQs

Can I substitute the ground beef?

Absolutely! Ground turkey or chicken work beautifully if you’re after a leaner option. You’ll barely notice the swap, especially with all those great flavors going on. Just follow the same browning instructions in the recipe.

Is this casserole low-carb?

If you skip the breadcrumb topping, this dish is quite low in carbohydrates and loaded with protein and vegetables. It’s a great fit for those focusing on low-carb eating but still craving something hearty and comforting.

Can I prep Ground Beef Zucchini Casserole ahead of time?

You sure can! Assemble everything up to the point of baking, then cover and refrigerate for up to 24 hours. Pop it in the oven when you’re ready—just add a few extra minutes to the baking time if it’s coming straight from the fridge.

How do I avoid watery casserole with zucchini?

This is a common worry, but slicing the zucchini and sautéing it helps release extra moisture before baking. Also, make sure to drain the tomatoes well for the best texture in your finished dish.

What other veggies could I add?

Feel free to give this casserole your own spin! Bell peppers, mushrooms, or spinach make fantastic additions and will blend right in. Just be sure to sauté any extra veggies so they’re tender before mixing into the main filling.

Final Thoughts

There’s just something so satisfying about a bubbly, cheesy bake like Ground Beef Zucchini Casserole—it hits all the right comfort notes without weighing you down. If you’ve never tried this cozy classic, now’s the perfect moment to bring it to your table. Give it a go and watch as everyone comes back for seconds!

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