Creating Spinach & Mushroom Tortellini Bake is simple if you follow these clear instructions:

1. Preheat the Oven: Set your oven to 350°F (175°C) to ensure it’s ready for cooking.
2. Cook the Tortellini: In a large pot, cook the tortellini according to the package instructions. Drain and set aside.
3. Sauté the Vegetables: In a large skillet, heat olive oil over medium heat. Add the sliced mushrooms and sauté for about 5 minutes until soft. Add the minced garlic, Italian seasoning, salt, and pepper, cooking for another minute.
4. Add Spinach: Stir in the chopped spinach and cook until wilted, about 2-3 minutes.
5. Prepare the Cream Sauce: Lower the heat and pour in the heavy cream, stirring continuously until it begins to simmer.
6. Combine Mixture: Fold the cooked tortellini into the skillet with the sauce, making sure each piece is well-coated.
7. Transfer to Baking Dish: Spray a baking dish with cooking spray or butter. Pour the tortellini mixture into the dish, spreading it evenly.
8. Add Cheese: Sprinkle the mozzarella and Parmesan cheese generously on top of the tortellini.
9. Bake: Place the dish in the preheated oven and bake for 30-35 minutes, or until the cheese is golden and bubbly.
10. Cool Slightly: Remove from the oven and let it sit for about 5-10 minutes before serving for easier slicing.

By following these simple steps, you will create a stunning Spinach & Mushroom Tortellini Bake that your whole family will love!