Follow these clear steps to create your own Butternut Squash Casserole:

1. Preheat the oven: Begin by preheating your oven to 375°F (190°C).
2. Prepare the squash: In a pot, boil the cubed butternut squash for about 10 minutes or until fork-tender. Drain and set aside.
3. Sauté the onions: In a skillet, sauté the chopped onion in a tablespoon of olive oil until they are translucent, about 5 minutes. Add the minced garlic and cook for an additional 1 minute. Remove from heat.
4. Combine ingredients: In a large mixing bowl, combine the boiled squash, cream, shredded cheddar cheese, Parmesan cheese, sautéed onions and garlic, eggs, salt, black pepper, thyme, and smoked paprika. Mix until well combined.
5. Transfer to baking dish: Pour the squash mixture into a greased 9×13-inch baking dish.
6. Add breadcrumbs: If you prefer a crunchy topping, sprinkle breadcrumbs evenly over the top.
7. Bake the casserole: Place the dish in the preheated oven and bake for 50-60 minutes, or until the top is golden brown and the casserole is set.
8. Cool slightly: Once baked, remove the casserole from the oven and let it cool for about 10 minutes to firm up.
9. Garnish: Optionally, garnish with freshly chopped parsley before serving to add a pop of color.

These straightforward steps will guide you in preparing an incredible Butternut Squash Casserole that tastes as good as it looks.