Cook ground beef in a large skillet over medium-high heat and cook, until slightly brown.
Add onions and continue cooking until onions are tender.
Add garlic and cook for another 1 minute.
Add in green, red salsas and tomato juice and cook for 5 minutes.
Preheat oven to 350°F.
Add rice to a large casserole dish.
Add meat mixture to casserole dish.
Add sour cream and stir to combine.
Season with salt and pepper if desired.
Top with Cheddar cheese.
Bake casserole, uncovered, for 30 to 40 minutes or until cheese is melted.