Zucchini Ground Beef Casserole

Featured in Satisfying Hearty Mains.

Layer cooked quinoa, browned beef, sautéed zucchini, and tomato sauce with cheese. Bake at 375°F for 25 minutes, broil to brown cheese. Ready in 1 hour.
Clare Greco
Updated on Mon, 17 Feb 2025 15:30:27 GMT
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In my quest for the perfect weeknight dinner, I stumbled upon this gem - a protein-packed casserole that combines juicy ground beef, garden-fresh zucchini, and fluffy quinoa. It's become my go-to when I want something that feels like a warm hug but doesn't weigh you down. Think of it as lasagna's lighter, more nutritious cousin that still brings all the comfort.

Last month, I brought this to a potluck and watched as people went back for seconds, then asked for the recipe. Even my neighbor's picky eaters cleaned their plates, which might be the highest praise a casserole can get.

Gathering Your Ingredients

  • Ground beef: needs to be 90% lean - trust me on this one
  • Fresh zucchini: should feel firm and heavy for their size
  • Quinoa: adds protein and a lovely nutty flavor
  • Mozzarella: creates that irresistible cheese pull
  • Tomato sauce: forms the backbone of flavor
  • Fresh garlic: brings everything alive
  • Italian seasonings: add depth and warmth
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Creating Casserole Magic

The Foundation:
Brown your beef until it's just right - not too done
Sauté:
Sauté onions until they're sweet and translucent
Cook:
Cook quinoa until each grain unfolds like a tiny flower
The Layers:
Salt your zucchini to draw out excess moisture
Combine:
Combine ingredients with a gentle touch
Top:
Top with a generous blanket of cheese
The Finale:
Watch for the cheese to bubble and brown
Let rest:
Let rest before serving - patience pays off
Garnish:
Garnish with fresh herbs if you're feeling fancy

Kitchen Comfort

Let me tell you about the magic that happens when this casserole bakes. The whole house fills with this incredible aroma - like an Italian restaurant set up shop in your kitchen. I love serving this straight from the oven, when the cheese is still stretchy and the edges are perfectly crispy. Usually, I'll throw together a quick salad while it bakes, but honestly, this dish can stand alone.

Making It Your Own

Sometimes I play around with this recipe depending on what's in my fridge. Last week, I threw in some yellow squash alongside the zucchini because it needed using up - turned out fantastic. When my vegetarian sister visits, I swap the beef for mushrooms and lentils. You'd be surprised how meaty it still tastes. During summer, when my garden's overflowing with tomatoes, I'll use those instead of canned - just cook them down a bit first.

Keeping It Fresh

Here's the thing about this casserole - it's actually better the next day. All those flavors get cozy together overnight in the fridge. I portion leftovers into containers for easy lunches. Pro tip: if you're planning to freeze some, cut it into portions first. That way you can grab just what you need later. I learned this the hard way after trying to chip off frozen pieces - not my finest moment!

Kitchen Wisdom

Over countless iterations of this recipe, I've picked up some tricks. Like, if your zucchini's really watery, lay the slices on paper towels while you prep everything else. And don't be shy with that top layer of cheese - it creates this amazing crust that everyone fights over. My grandmother always said a casserole should be generous, and she was right.

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Baker's Gold

  • Those browned cheese edges are worth their weight in gold
  • Fresh herbs sprinkled on top make it look fancy
  • Let it rest for 10 minutes - trust me on this one

This casserole has saved many busy weeknights at my house. It's what I make when friends drop by unexpectedly or when someone in the neighborhood needs a meal. There's something about a bubbling, cheesy casserole that just makes everything feel right with the world. And isn't that what good cooking is all about?

Frequently Asked Questions

→ Can I freeze this casserole?
Yes, you can split it between two 8x8 dishes and freeze one for later. Thaw overnight before baking.
→ Can I use pre-cooked quinoa?
Yes, leftover quinoa works great. You need 3 cups cooked quinoa total.
→ How do I prevent a watery casserole?
Be sure to drain the diced tomatoes well and don't overcook the zucchini before baking.
→ Can I substitute the quinoa?
Yes, you can use rice or other cooked grains instead of quinoa.
→ How long does it keep?
Stores well in the refrigerator for 3-4 days, perfect for meal prep.

Zucchini Ground Beef Casserole

A hearty, nutritious casserole combining ground beef, zucchini, quinoa, and melty cheese - perfect for family dinners!

Prep Time
20 Minutes
Cook Time
40 Minutes
Total Time
60 Minutes

Category: Hearty Mains

Difficulty: Intermediate

Cuisine: American

Yield: 6 Servings (1 9x13 casserole)

Dietary: Gluten-Free

Ingredients

→ Base Ingredients

01 3 cups cooked quinoa (from 1 cup dried)
02 1 lb ground beef
03 2 medium zucchinis (1.5-2 lbs), chopped into bite-size pieces
04 1 small yellow onion, diced

→ Sauce and Seasonings

05 2 tablespoons olive oil, divided
06 1 (14.5 oz) can tomato sauce
07 1 (14.5 oz) can diced tomatoes, drained
08 1 tablespoon Italian seasoning
09 1 teaspoon dried oregano
10 1 teaspoon garlic powder
11 1 teaspoon dried basil
12 1 teaspoon sea salt, divided
13 ½ teaspoon black pepper

→ Topping

14 2 cups shredded mozzarella cheese, divided

Instructions

Step 01

Preheat oven to 375°F. Grease a 9x13 inch casserole pan. Cook quinoa if not using leftovers.

Step 02

Heat 1 tablespoon olive oil over medium heat. Brown ground beef with onions and ½ teaspoon salt for about 5 minutes. Transfer to casserole dish.

Step 03

In same pan, heat remaining oil. Cook zucchini with remaining salt, covered, for 5 minutes until soft. Add tomato sauce and drained diced tomatoes.

Step 04

Add cooked quinoa, zucchini mixture, all seasonings, and 1 cup mozzarella to casserole dish. Fold together and spread evenly.

Step 05

Top with remaining cheese. Bake 25 minutes, then broil 2-5 minutes to brown cheese. Let rest 5 minutes before serving.

Notes

  1. Can use leftover cooked quinoa
  2. Can be split between two 8x8 dishes and frozen
  3. Cut zucchini into appropriate size based on their size

Tools You'll Need

  • 9x13 inch casserole dish
  • Large frying pan
  • Wooden spatula

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains dairy