In a large bowl, combine the squash rings, buttermilk, eggs and hot sauce. Allow the squash to rest in the buttermilk for at least 30 minutes at room temperature. In another bowl, combine the panko, flour, herbs de provence, onion powder, garlic powder, baking powder, kosher salt and ground pepper.
Using a pair of tongs, grab one of the squash rings, shake off the excess batter and dip it into the panko. Once it is coated, add the squash rings to a baking sheet. Repeat the process until you have about 5 to 6 rings.
Preheat the air fryer at 380 degrees for about 5 minutes. Once preheated, add the squash rings to the basket and spray the tops with non-stick cooking spray. Cook on the first side for about 7 to 8 minutes. Flip, and spray the tops again with cooking spray, and continue to cook for about 7 to 8 minutes on the other side. If the rings aren’t crispy keep cooking until done to desired consistency.
Remove the rings and place on a plate. Garnish with more salt and pepper, if desired. Repeat the process to make the remaining rings.