How to Make It
In a large resealable plastic bag, combine the soy sauce with the vinegar, onion, garlic, crushed red pepper, thyme, cinnamon, nutmeg and 1 teaspoon of the garlic powder. Add the chicken tenders, seal the bag and turn to coat. Let the chicken marinate at room temperature for 1 hour.
Meanwhile, in a food processor, combine the panko with the salt, onion powder, black pepper and the remaining 1 1/2 teaspoons of garlic powder and pulse until the panko is finely ground. Transfer the seasoned crumbs to a pie plate. In another pie plate, beat the egg whites until foamy.
Remove the chicken tenders from the marinade, scraping off any solids. Pat the chicken tenders dry with paper towels and transfer them to a wax paper–lined baking sheet. Dip the tenders in the egg whites, letting the excess drip back into the pie plate, then dredge them in the seasoned crumbs. Transfer the chicken tenders to the baking sheet.
Set a rack over another baking sheet. In a large skillet, heat 1/3 inch of canola oil until shimmering. Working in two batches, fry the chicken tenders over moderately high heat, turning once, until they are well-browned and crisp, about 7 minutes per batch. Transfer the tenders to the rack to drain. Serve with Kohlrabi Slaw.