- Preheat your oven to 375°F (190°C).
- Cook the gluten-free mostaccioli according to package instructions until al dente.
- In a large skillet, cook the Italian sausage over medium heat until browned. Drain excess fat.
- Add the fresh spinach to the skillet and cook until wilted.
- Stir in the marinara sauce, ricotta cheese, Italian seasoning, salt, and pepper.
- Combine the cooked mostaccioli with the sausage and spinach mixture.
- Transfer the mixture to a baking dish and top with shredded mozzarella and grated 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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