Step 1

Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x12-inch baking pan.

Step 2

Melt butter in a skillet over medium heat. Add onion, bell pepper, and pimento peppers and saute until tender, about 5 minutes.

Step 3

Combine eggs, corn muffin mix, green chiles, whole corn, and creamed corn in a large bowl with the onion mixture. Stir together and pour into the prepared baking pan. Drop sour cream by the spoonful on top of the mixture; cover with Cheddar cheese.

Step 4

Bake in the preheated oven until casserole is firm, about 45 minutes.