easy spicy black beans and rice casserole

Ingredients

• 2-3 cups cooked white or brown rice
• 1 can black beans rinsed and drained
• 1 can niblets corn
• 2 cups shredded cheese, divided
• 1 cup lowfat sour cream
• 1 cup salsa
• 1 can black olives
• 1 - small to medium red onion chopped
• 1 can sliced jalapeno peppers, not pickled
• 1 can rotel
• * - or 1 28 oz can tomates, + small chopped onion, +jalapeno's to taste, +1 tsp onion salt,+ 1/2 tsp cumin, +pinch of sugar,and chopped hot peppers, 1 -3tbs,... instead of the rotel and salsa