Crispy Fried Calamari

Ingredients: 1 pound fresh calamari, cleaned and cut into rings 1 cup all-purpose flour 1/2 cup cornstarch 1 teaspoon garlic powder 1 teaspoon paprika 1/2 teaspoon salt 1/2 teaspoon black pepper 1/2 teaspoon cayenne pepper (optional, for a bit of heat) 1 cup buttermilk Vegetable oil for frying