Creating Sour Cream Beef Noodle Casserole is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Noodles: In a large pot, bring salted water to a boil. Add the egg noodles and cook according to package instructions until al dente, usually around 6-8 minutes. Drain and set aside.
3. Brown Beef: In a large skillet over medium heat, add olive oil. Once hot, add the chopped onion and cook until translucent. Then, add the ground beef, cooking until browned and no longer pink. Drain any excess fat.
4. Mix Ingredients: In the same skillet, add garlic powder, salt, and black pepper to the beef mixture. Stir in the cream of mushroom soup and sour cream until well combined.
5. Combine Noodles and Beef: Gently fold in the cooked egg noodles into the beef mixture until evenly coated.
6. Transfer to Casserole Dish: Spread the beef and noodle mixture into a greased 9×13-inch casserole dish.
7. Add Cheese: Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
8. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until the cheese is melted and bubbly.
9. Cool and Serve: Remove from the oven and let the casserole cool for 10-15 minutes, allowing the flavors to set.

By following these steps carefully, you will create a deliciously comforting Sour Cream Beef Noodle Casserole that the whole family will love.