Creating the Hearty Creamy Mushroom & Ground Beef Bake is simple when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and lightly grease a baking dish.

2. Cook Beef: In a large skillet over medium heat, add the ground beef. Cook until browned, breaking it apart as it cooks. Drain any excess grease.

3. Add Vegetables: Add the chopped onion and sliced mushrooms to the skillet. Sauté until the onions are translucent and mushrooms are tender, about 5-7 minutes.

4. Add Garlic: Stir in the minced garlic and cook for an additional minute until fragrant.

5. Create Sauce: Pour in the heavy cream and beef broth. Stir in Worcestershire sauce, dried thyme, salt, and black pepper. Bring the mixture to a simmer.

6. Combine Ingredients: If using, add the frozen peas and cooked pasta to the skillet, stirring to combine everything evenly.

7. Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it out evenly.

8. Top with Cheese: Sprinkle the shredded cheese generously over the top of the mixture.

9. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and golden.

10. Garnish: Once baked, remove from the oven and let it cool slightly. Garnish with fresh parsley before serving.