Hamburger Pie

• 1 medium onion, chopped
• 1 tablespoon olive oil
• 1 tablespoon butter
• 1 pound lean ground beef
• salt and pepper
• 1/2 pound cooked green beans, or 1 1/2 to 2 cups frozen cooked or canned and drained
• 1 can (10 1/2 ounces) condensed tomato soup
• 5 to 6 medium potatoes, cooked and mashed with milk and seasonings
• 1/2 cup milk, heated
• 1 egg, beaten
• 1/2 teaspoon salt, or to taste
• 1/2 teaspoon pepper

Heat oil and butter in a skillet over medium heat; cook chopped onion until tender and browned. Add meat and seasonings; brown, stirring to break up. Drain off excess fat. Stir in beans and soup; transfer to a greased 9-inch square baking dish. Spoon mashed potatoes in mounds over the beef mixture. Bake at 350° for 30 minutes.
Hamburger pie recipe serves 4 to 6.