1Preheat oven to 400 degree F. Grease an 8 x 8 baking dish.
In a medium saucepan, over medium heat, brown onion in butter.
Remove from heat and add the milk, muffin mix, sour cream, salt, Cayenne, cheddar cheese, Chile's and stir until blended. Stir in egg making sure it's well incorporated.
2Pour batter into prepared pan and sprinkle the top evenly with Colby cheese or even pepper Jack.
3Bake for 20 - 25 minutes or until pick inserted in center comes out clean. Should be golden on top. I then brush the top while hot with butter. Just something I always do. I leave set for 5 minutes before cutting as they are very moist. This gives the cheese a few minutes to set.