Rinse the chicken and pat it dry. Lay the drumsticks side-by-side in a 9x13-inch glass dish that has been sprayed with nonstick spray.
In a medium bowl, whisk together the remaining ingredients. Pour the marinade over the chicken and turn it to coat completely. Cover the dish with plastic wrap and refrigerate for 1 hour (or up to 4 hours). Turn the chicken every once in a while to reincorporate the marinade ingredients.
Preheat the oven to 375℉. Drain the chicken from the marinade and transfer it to a roasting pan (or you can choose to bake it in the pan with the marinade). Bake for 50 to 60 minutes, or until the chicken is tender and juices run clear when pierced with a fork.
Notes
This recipe is gluten-free adaptable: Use a brand of Dijon that is known to be GF.