1/2 large onion
1 1/2 tsp. butter
4 cups chopped chicken
1 (10 3/4 ounce) can cream of chicken soup
1 cup sour cream
1/2 cup milk
1 cup shredded mild cheddar cheese, divided
6 frozen biscuits, thawed

Preheat oven to 350°F. Grease the bottom and sides of a 11 x 7 inch baking dish.

Chop the onion. Heat butter in a small non-stick skillet over medium-high heat until melted. Stir in chopped onion. Sauté until tender.

Combine onion, chicken soup, sour cream and milk in a medium bowl and mix well. Spoon into the prepared baking dish.

Bake for 15 minutes. Remove from oven. Sprinkle baked layer with 3/4 cup of cheddar cheese. Arrange biscuits in single layer over top. Sprinkle with remaining cheese.

Bake until biscuits are golden brown and the sauce is bubbly, about 20-25 minutes longer. Serve immediately.