British Antarctic Territory Pie

Ingredients

• 1.00 cup onion
• 2.00 tablespoons butter
• 3.00 cups flour
• 2.00 cups milk
• 1.00 teaspoon salt
• 1.00 teaspoon black pepper
• 1.00 pound ground beef
• 1.00 cup frozen mixed vegetables
• 1.00 cup cheddar cheese
• 1.00 cup bread crumbs