Firecracker Onion Rings

Name: Firecracker Onion Rings
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: Southern, American
Ingredients: 1 jumbo sweet onion (OR 2 large onions, sliced); 1 1/2 cups buttermilk; 2 Tbsp hot sauce; 1 1/2 cups self rising flour; 3 1/2 tsp Creole (Cajun or Old Bay seasoning, divided use); 1/4 tsp ground black pepper; 1 tsp kosher salt; 2 large eggs (beaten); 3 cups panko bread crumbs; 1/4 cup grated Parmesan cheese; 3 Tbsp canola oil or peanut oil; cooking spray