Directions

1. In a skillet, cook the ground beef until it's thoroughly done; add the salt, pepper, and garlic powder.
   
2. In a medium saucepan, melt 2 tablespoons of the butter, stir in the cornstarch, and cook until thoroughly combined. Stir in the milk. Cook for 5 or 6 minutes until thoroughly heated.
   
3. Remove from the heat and add in the grated cheese. Stir until it melts. Add the sour cream, mix it thoroughly.
   
4. Pour the cheese mixture over the pasta and mix thoroughly.
   
5. In a separate skillet, saute the onions and bell peppers in the remaining 2 tablespoons of butter. Saute for 8 to 10 minutes or until soft.
   
6. Add the onions and peppers to the ground beef and mix thoroughly.
   
7. Combine the beef mixture with the pasta mixture and mix well. Transfer to a casserole dish.
   
8. Sprinkle the top with the brioche breadcrumbs.
   
9. Bake in a 350-degree oven for 15 to 20 minutes. Enjoy!