Easy Low Carb Ground Turkey Zucchini Casserole – High-Protein Dinner

If you’re looking for a comforting dinner that brings together lean protein, fresh vegetables, and plenty of cheesy flavor, this easy low carb ground turkey zucchini casserole is a great choice. Made with ground turkey, sliced zucchini, garlic, onion, marinara sauce, mozzarella, and Parmesan, it delivers the satisfying flavors of a baked Italian-inspired meal without the need for pasta or grains.

This ground turkey zucchini casserole is ideal for busy weeknights when you want something hearty and easy to prepare. The turkey is browned with onion, garlic, and oregano before being combined with marinara sauce. Layers of zucchini and savory turkey mixture are then topped with two kinds of cheese and baked until bubbly and golden.

With just 20 minutes of preparation and 30 minutes of cooking, this casserole fits nicely into a weekly dinner routine. It also makes six servings, so leftovers can be saved for convenient lunches or another easy meal.

Why You’ll Love This Recipe

• High in protein: Lean ground turkey and cheese provide 34 grams of protein per serving, according to the supplied nutrition information.
• Low-carb dinner option: Zucchini replaces traditional pasta layers, keeping the dish grain-free.
• Simple ingredients: The recipe uses familiar ingredients that are easy to find at the grocery store.
• Rich, savory flavor: Garlic, oregano, marinara sauce, mozzarella, and Parmesan create a delicious combination.
• Great for meal prep: The casserole keeps in the refrigerator for up to four days.
• Easy to customize: Ground chicken can replace ground turkey if you prefer.

Ingredients You’ll Need

Here is what you need to make this low carb ground turkey zucchini casserole.

• Ground turkey: Use 1.5 pounds (680 g) of 93% lean ground turkey for a flavorful, protein-rich base.
• Zucchini: Three large zucchini, approximately 2 pounds (900 g), are sliced into 1/4-inch rounds and layered throughout the casserole.
• Extra virgin olive oil: One tablespoon is used to sauté the onion and begin cooking the turkey mixture.
• Yellow onion: One medium onion, finely diced, adds sweetness and savory flavor.
• Garlic: Four minced cloves bring aromatic flavor to the turkey and marinara sauce.
• Low-sugar marinara sauce: Two cups provide a rich tomato base. Choose a variety that fits your dietary preferences.
• Shredded mozzarella: One and a half cups create a soft, melty cheese topping.
• Grated Parmesan: Half a cup adds a savory finish and complements the mozzarella.
• Dried oregano: One teaspoon gives the sauce an Italian-inspired flavor.
• Fresh parsley: Use it as a garnish before serving.

How to Make Ground Turkey Zucchini Casserole

Step 1: Prepare the Oven

Preheat your oven to 375°F (190°C). Grease a 9 × 13-inch baking dish so the casserole is easier to serve after baking.

Slice the zucchini into 1/4-inch rounds. If the slices feel particularly wet, press excess moisture out with paper towels before assembling the casserole. This helps prevent too much liquid from collecting in the dish.

Step 2: Sauté the Onion

Heat the olive oil in a large skillet over medium-high heat. Add the finely diced onion and sauté until translucent.

Cooking the onion first helps soften it and brings out its natural sweetness, creating a flavorful base for the turkey mixture.

Step 3: Brown the Ground Turkey

Add the ground turkey to the skillet. Cook until fully browned, breaking it into small crumbles as it cooks.

Make sure the turkey is cooked through before moving to the next step. Breaking it into smaller pieces also makes it easier to distribute evenly between the zucchini layers.

Step 4: Add the Garlic and Oregano

Stir in the minced garlic and dried oregano. Cook for another minute, just until fragrant.

This brief cooking time allows the garlic and oregano to release their flavors without leaving the garlic cooking for too long.

Step 5: Stir in the Marinara Sauce

Pour the low-sugar marinara sauce into the skillet and stir until the turkey mixture is evenly coated.

The sauce brings the ingredients together and helps keep the turkey flavorful as the casserole bakes.

Step 6: Assemble the Casserole

Arrange a layer of zucchini rounds across the bottom of the prepared baking dish.

Spread the ground turkey and marinara mixture over the zucchini. Add the remaining zucchini slices on top, then sprinkle the mozzarella and Parmesan evenly over the surface.

Try to distribute the cheese across the dish so the finished casserole has a cheesy topping from edge to edge.

Step 7: Bake Until Golden

Cover the baking dish with foil and bake for 20 minutes.

Remove the foil and continue baking for another 10 minutes, until the cheese is bubbly and golden.

Let the casserole settle briefly before serving, then garnish with fresh parsley.

Tips for the Best Zucchini Casserole

Remove excess moisture from the zucchini. Zucchini naturally releases water as it cooks. Pressing the slices with paper towels before assembling helps keep the casserole from becoming too watery.

Use 93% lean ground turkey. This is the type specified in the recipe and provides a balance of flavor and protein.

Choose a low-sugar marinara sauce. Compare labels when shopping, as the amount of sugar can vary between brands.

Spread the ingredients evenly. A balanced layer of zucchini, turkey mixture, and cheese helps each serving include all the main components.

Watch the cheese during the uncovered baking time. The final 10 minutes help the cheese become bubbly and golden, so check toward the end to avoid over-browning.

Easy Variations

• Ground chicken casserole: Substitute lean ground chicken for the ground turkey, as suggested in the recipe notes.
• Adjust the cheese: Keep the mozzarella and Parmesan quantities as written for the intended cheesy topping, or choose different cheeses if you have a preference.
• Add fresh parsley: Finish each serving with fresh parsley for a fresh, colorful garnish.
• Choose your marinara carefully: A low-sugar marinara helps the recipe stay aligned with a lower-carbohydrate meal plan.

What to Serve with This Casserole

This ground turkey zucchini casserole can be served on its own as a filling dinner. If you’d like to add something alongside it, consider a simple green salad, steamed broccoli, roasted cauliflower, or sautéed green beans.

For a low-carb meal, vegetable-based sides work especially well without adding pasta, rice, or bread.

Storage and Meal Prep

Refrigeration: Store leftover casserole in a covered container in the refrigerator for up to 4 days, as specified in the recipe notes.

Reheating: Reheat individual portions until heated through. A microwave is convenient for single servings, while an oven can be used to warm larger portions.

Meal prep: Divide the casserole into six portions after cooking for convenient meals throughout the week. Allow it to cool before storing, and refrigerate leftovers promptly.

Frequently Asked Questions

Is ground turkey zucchini casserole low-carb?

This recipe is designed as a low-carb casserole because it uses zucchini instead of pasta or grains. The supplied nutrition information lists 12 grams of carbohydrates and 3 grams of fiber per serving. Actual values may vary depending on the marinara sauce and other ingredients used.

How do I keep zucchini casserole from getting watery?

Press excess moisture from the sliced zucchini with paper towels before assembling the casserole. This simple step helps reduce the amount of liquid released during baking.

Can I use ground chicken instead of ground turkey?

Yes. The recipe notes recommend lean ground chicken as an alternative to ground turkey. Follow the same cooking and assembly instructions.

Can I make this casserole ahead of time?

You can prepare the ingredients and assemble the casserole ahead of baking, then keep it refrigerated until you’re ready to cook it. The recipe’s specified baking time is 20 minutes covered and another 10 minutes uncovered; if baking straight from the refrigerator, check that the center is heated through before serving.

How long does it keep in the refrigerator?

The recipe notes state that leftovers can be refrigerated for up to four days. Store them in a covered container and reheat portions thoroughly before eating.

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