Potsie's Creamed Chicken and Biscuits Casserole

INGREDIENTS

lbs Chicken breasts, cooked

Onion, small

1 10 3/4 ounce can

Cream of chicken soup

1/2 cup

Mayonnaise

Biscuit, Refrigerated

1 1/2 tsp

Butter

1 1/2 cups

Cheddar cheese, mild

1 cup

Milk

½ cup chopped pimiento or ½ cup sauteed red bell peppers or ½ cup jarred roasted red pepper