How to Make Crispy Onion Rings

INGREDIENTS

• 1/2 cup all-purpose flour
• 1/4 cup cornstarch
• 2 tablespoons dry potato flakes
• 1/8 teaspoon cayenne pepper, or to taste
• 1 cup chilled club soda
• 2 cups panko bread crumbs, or as needed
• 2 cups vegetable oil for frying
• 2 large onions, cut into 1/4-inch thick slices and separated into rings
• fine salt to taste