Shepherd's Pie from Leftover Beef Roast and Mashed Potatoes
Ingredients
- 1 small onion, peeled and chopped
- 14 tablespoons butter, divided (1 stick plus 3/4 stick)
- 1 1/2 pounds leftover pot roast, cubed
- Salt and black pepper
- 8 to 10 medium red new potatoes
- 2 cups milk
- 1/2 cup sour cream
- 2 cups instant biscuit mix
- 1 1/2 cups niblet corn or mixed vegetables, prepared according to package dire