In a large skillet, saute onions, peppers & garlic in oil until tender-crisp, about 5 minutes. Stir in tomato sauce & salsa; simmer 2 minutes, stirring occasionally. Stir in shrimp & corn; simmer 2 minutes. Stir in bacon.
Preheat oven to 375 F. Spoon cooked rice in a buttered, 9 X 13-inch baking dish; top with shrimp mixture & cheese. Cover with foil. Bake casserole, covered, 35 minutes or until heated through, uncovering the last 20 minutes.