Preheat oven to 350 degrees. In a large bowl, mix corn muffin mix, both cans of corn, sour cream, melted butter and jalapenos (if desired). Bake for 45-50 minutes or until golden brown. Remove from oven. Top with cheddar cheese and return to oven for 5 minutes or until cheese has melted. Let stand for 5 minutes to let cool. Serve.