String Pie

Ingredients

• 1 lb. ground beef
• 1/2 c. chopped onion
• 1 jar spaghetti sauce (or more depending on your taste)
• 8 oz spaghetti (cooked, drained, hot)
• 1/3 c. parmesan cheese
• 15 oz container ricotta cheese
• 1/2 c. or more shredded mozzarella cheese
• 2 eggs, beaten
• 2 Tbsp. melted butter