Hamburger Pie

Ingredients

• 1 lb. ground beef
• 1/2 c. chopped onion
• 1/2 tsp. salt
• dash of pepper
• 1 (1 lb.) can cut green beans, drained
• 1 (10 3/4 oz.) can condensed tomato soup
• 5 medium potatoes, cooked*
• 1/2 c. warm milk
• 1 beaten egg
• 1/2 c. shredded American cheese