Bread the chicken: Sift all breading ingredients 3 times through a gluten free flour tamis (see Note) or very fine mesh strainer into a large bowl, discarding any lumps. Working in batches, remove 4 or 5 tenders at a time from the buttermilk marinade and toss in the breading, coating well. Transfer to a baking sheet and let rest until the breading adheres, 15 to 20 minutes.