Beef n biscuit casserole

1-1 1/2 pound ground beef
1/2 c. chopped onion
1/4 c. chopped green pepper
12 oz. tomato sauce
1 tsp. chili powder
1/2 tsp. garlic salt
2 cans flaky buttermilk biscuits, all separated in half
1 1/2 cups shredded cheddar cheese, divided
1/2 cup sour cream
1 egg, beaten

Oven 375 degrees. Greased 9 x 13 inch pan (I always use a glass one). Brown ground beef, onion and green pepper, drain. Stir in garlic salt, tomato sauce and chili powder. Mix 3/4 cup cheddar cheese, sour cream and beaten egg in a separate bowl, add to ground beef mixture. Simmer while preparing biscuits. Place one-half of the biscuits in bottom of a greased 9 x 13 inch pan. Spoon ground beef mixture over biscuits and top with remaining biscuits, stretching slightly. Sprinkle remaining cheese over biscuits. Bake, uncovered, at 375 degrees for 25-30 minutes or until biscuits are golden brown.