Cut chicken into bite-sized pieces.
Marinate in buttermilk + seasonings (30 min–4 hrs).
Set up coating station: flour, eggs, breadcrumbs mix.
Dredge chicken in flour, dip in egg, coat in breadcrumbs.
Rest coated nuggets on rack for 10 min.
Preheat oven to 425°F, line sheet with parchment.
Arrange nuggets, spray with oil.
Bake 12–15 min, flip halfway, until golden brown.
Ensure 165°F internal temp, serve hot.