Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a large mixing bowl, combine the drained black beans, diced tomatoes and green chiles, tomato sauce, salsa, and cooked rice. Mix well.
Step 3: Fold in the sour cream into the mixture.
Step 4: Spread half of the black bean and rice mixture into the bottom of your greased baking dish. Sprinkle one cup of shredded cheddar cheese over the top.
Step 5: Layer the remaining black bean and rice mixture on top of the cheese, spreading it evenly. Top with the remaining cup of shredded cheddar cheese.
Step 6: Cover with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and golden.
Step 7: Let the casserole sit for a few minutes before serving.
