0.5 cups  Wholemeal Wheat Flour

0.25 tsp  Sea Salt

0.25 tsp  Garlic Powder , plus more as needed

0.25 tsp  Onion Powder

Ground Black Pepper

1 cups  Panko

Sweet Onions , sliced into 0.5-inch-thick rings (about 18 to 20)

Ketchup , for serving (optional)