How to Make crispy, delicious, best-in-the-world onion rings

Onion rings or French fries? The debate for which American-food side dish is superior will rage on until the end of cooking. This video makes a very convincing argument for the supremacy of the onion ring, presenting a recipe for them using unconventional ingredients to create what the chef in the video insists are the most delicious onion rings on Earth.

Ingredients:

1/2 cup all-purpose flour
1/4 cup cornstarch
2 tablespoons instant mashed potatoes
big pinch of cayenne
1 cup cold club soda
2-3 cups Panko (Japanese-style breadcrumbs), or as needed
fine salt to taste
vegetable oil for frying
2-3 yellow onions, cut into 1/4-inch rings
*Note: the amounts in the video were for a smaller batch. The amounts above will make a nice large batch, enough for about 8 servings.