Cheeseburger Muffins Recipe

Ingredients

• 1 small onion, chopped
• 1/2 lb. ground beef
• 2 1/2 cups flour
• 1 Tbsp. sugar
• 2 tsp. baking powder
• 1 tsp. salt
• 3/4 cup ketchup
• 3/4 cup milk
• 1/2 cup butter, melted
• 2 eggs
• 1 tsp. yellow mustard
• 1 cup cheddar cheese, shredded
• nonstick spray
• 2 Tbsp. butter