Old Fashioned Onion Rings

Ingredients

• 1 large onion, cut into 1/4-inch slices
• 1 ¼ cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon salt
• 1 large egg
• 1 cup milk
• ¾ cup dry bread crumbs
• 1 quart oil for frying, or as needed