Mix together Panko, ½ cup sugar and 1 teaspoon cinnamon in a medium bowl, set aside. In a large bowl, stir together the Tempura Batter Mix, cornstarch, baking powder, salt and remaining ¼ cup sugar and 2 teaspoons of cinnamon. Add Soymilk to the flour mixture with a whisk to make a smooth batter. Peel the apples and slice into 6 circles. Remove the seeds from each apple ring with a sharp knife. Add the apple rings to the batter, coating all sides. Heat a deep fryer or a large pan to 350º and add 1-1/2 to 2 inches of oil. Dredge the battered apple rings through the panko crumbs and place in the hot oil, several at a time so they don’t touch. Fry until brown, then flip and brown the other side. Remove from oil and drain on a paper towel. Cook the remaining coated apple rings. Sprinkle with powdered sugar. Serve warm.