Creating Mouthwatering Creamy Garlic Mushroom Stuffed Shells is quite manageable when you follow these simple steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C) to prepare for baking.
2. Cook the Pasta: Boil a large pot of salted water. Add the jumbo pasta shells and cook according to package instructions, until al dente. Drain and set aside to cool.
3. Sauté the Mushrooms: In a large skillet, heat the olive oil over medium heat. Add diced mushrooms and cook until golden, about 5-7 minutes. Stir in minced garlic and sauté for an additional minute.
4. Prepare the Filling: In a mixing bowl, combine cooked mushrooms, ricotta cheese, half of the mozzarella cheese, Parmesan cheese, Italian seasoning, salt, and pepper. Stir until well blended.
5. Stuff the Shells: Spoon the mushroom and cheese mixture into each cooked pasta shell, filling them generously.
6. Prepare the Sauce: In the same skillet, add the heavy cream and bring it to a gentle simmer. Add any remaining mushrooms, stirring to combine, and season with salt and pepper.
7. Spread the Sauce: Spread a thin layer of the creamy sauce on the bottom of a baking dish. Place the stuffed shells in the dish, open side up.
8. Add More Sauce: Pour the remaining sauce over the stuffed shells, ensuring they are well covered. Sprinkle the remaining mozzarella cheese on top.
9. Bake: Cover the baking dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10-15 minutes until bubbly and golden brown.
10. Garnish: Let the shells cool for about 15 minutes. Garnish with fresh parsley before serving.

These steps will guide you in creating this incredible dish effortlessly.