Preheat oven to 350
Sautee onions in a skillet for 3-4 mins
Add ground beef and garlic powder
Cook until meat is brown (drain if desired)
Add cooked rice, tomato sauce, 1 cup of cheese, and chicken broth
Cook in the skillet on medium heat until bubbling
Prepare casserole dish with non-stick spray
Add the meat mixture to the square casserole dish
Bake for 15 minutes
In a bowl, combine the remaining 1 cup of shredded cheese with sour cream
Remove the dish from the oven and spread the special sour cream cheese sauce on top
Return the casserole to the oven and bake for an additional 25-30 minutes, or until bubbly.
Serve hot, and enjoy!