Ultimate Low-Carb Zucchini Lasagna

Step 1
Preheat the oven to 375 degrees F (190 degrees C). Grease an 8-inch baking dish with cooking spray.

Step 2
Pat dry zucchini slices with a paper towel to remove excess moisture. Set aside.

Step 3
Heat olive oil in a saucepan over medium-high heat. Add ground beef; cook until browned, 5 to 8 minutes.

Step 4
Add marinara sauce, 1 teaspoon salt, oregano, and pepper; simmer for 10 minutes. Set aside.

Step 5
Combine ricotta cheese, egg, 1 teaspoon salt, and nutmeg in a bowl; mix well. Set aside.

Step 6
Arrange one layer of zucchini slices in the prepared baking dish. Cover with 1/2 of the sauce. Add another layer of zucchini slices. Spread ricotta mixture on top. Sprinkle with 1/2 of the mozzarella cheese. Add another layer of zucchini slices; cover with remaining sauce and top with remaining mozzarella cheese and Parmesan cheese. Cover the baking dish with aluminum foil.

Step 7
Bake in the preheated oven for 30 minutes. Remove aluminum foil and bake until top is golden, about 15 minutes more.