- Preheat the oven to 375°F (190°C).
- Cook the gluten-free penne pasta according to package instructions until al dente. Drain and set aside.
- In a large skillet, cook the Italian sausage over medium heat until browned. Drain excess fat.
- Add the chopped spinach to the skillet and cook until wilted.
- Stir in the marinara sauce, ricotta cheese, garlic powder, onion powder, salt, and pepper. Mix well.
- Combine the cooked penne pasta with the sausage and spinach mixture.
- Transfer the mixture to a greased baking dish and top with mozzarella and Parmesan cheese.
- Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and golden.
- Let it cool for a few minutes before serving.
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