Creating Cheesy Butternut Squash Casserole can be a fun and rewarding experience. Follow these simple steps to ensure success:

1. Preheat the Oven: Set your oven to 375°F (190°C) to preheat while you prepare the casserole.
2. Prepare the Squash: In a large pot, bring salted water to a boil. Add the cubed butternut squash and cook until tender, about 10-12 minutes. Drain and set aside.
3. Make the Cheese Mixture: In a large bowl, combine the heavy cream, minced garlic, salt, pepper, nutmeg, and thyme. Whisk until well mixed.
4. Combine Ingredients: Add the cooked butternut squash to the cheese mixture. Gently fold in the shredded cheddar and mozzarella cheese, ensuring the squash is well coated.
5. Transfer to Baking Dish: Grease a 9×13-inch baking dish with olive oil. Pour the butternut squash mixture into the dish, spreading it evenly.
6. Prepare the Topping: In a small bowl, mix the breadcrumbs and grated Parmesan cheese. Sprinkle this mixture evenly over the squash mixture to create a crispy topping.
7. Bake: Place the baking dish in the preheated oven and bake for 40-45 minutes, or until the top is golden brown and bubbly.
8. Cool: Once done, remove the casserole from the oven and allow it to cool for about 5-10 minutes before serving.
9. Garnish: Just before serving, sprinkle freshly chopped parsley on top for a pop of color and added flavor.

These steps will guide you in creating this incredible Cheesy Butternut Squash Casserole effortlessly.