Follow these straightforward steps to create your own Sausage Green Bean Potato Casserole:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Cook Sausage: In a large skillet, heat the olive oil over medium heat. Add the sausage and cook until browned, breaking it into smaller pieces, about 5-7 minutes.
3. Sauté Vegetables: Add the chopped onion and minced garlic to the skillet. Sauté for an additional 3-4 minutes until softened.
4. Combine Ingredients: In a large mixing bowl, combine the cooked sausage mixture, diced potatoes, green beans, cream of mushroom soup, milk, salt, pepper, and paprika if using. Mix until everything is combined.
5. Transfer to Casserole Dish: Pour the mixture into a greased 9×13 inch casserole dish, spreading it evenly.
6. Cover and Bake: Cover the dish with aluminum foil and place it in the preheated oven. Bake for 30 minutes.
7. Add Cheese: After 30 minutes, remove the foil. Sprinkle the shredded cheese evenly over the top.
8. Finish Baking: Return the casserole to the oven without the foil and bake for an additional 15-20 minutes until the cheese is melted and bubbly, and the potatoes are tender.
9. Cool and Serve: Once done, remove the casserole from the oven and let it cool for a few minutes before serving.

By following these simple steps, you’ll have a warm and inviting casserole perfect for any occasion.