Step 1

Place the onions and ground beef into a skillet over medium-high heat, and saute until the meat is browned and the onions have softened.

Step 2

Mix in the garlic, and saute for another 30 seconds. Drain the extra grease.

Step 3

Reduce the heat to medium, and season the mixture with oregano, salt, and pepper to taste.

Step 4

Mix in the tomato sauce, rice, peas, broth, and one cup of cheese. Simmer the mixture until the cheese has melted.

Step 5

Spread the mixture into a well-greased casserole dish, and bake for 15 minutes in a 250-degree preheated oven.

Step 6

Blend together the sour cream and remaining cheese in a bowl.

Step 7

Spread the sour cream mixture over the casserole, and bake for another 15-20 minutes.