Preheat oven to 425 degrees.

Line two baking sheets with wire cooling racks, and spray with non-stick olive oil spray.

Cut onion into thick rings, separate each ring.

Mix buttermilk and sirracha together in a shallow baking dish.

Add onion rings, and toss, making sure each ring is coated. Let soak for 15 minutes.

To make the coating throw the package of crispy into the food processor, pulse until the pretzels resemble a panko bread crumb.

Transfer to a deep bowl or plate.

Take onion rings soaked in buttermilk and coat in pretzels.

Transfer to rack.

Spray rings with olive oil spray and bake until golden brown and super crispy, about 18-22 minutes.