Coat the inside of you slow cooker bowl generously with vegetable oil spray. Set it aside.
Mix together the sugar, garlic powder, onion powder, dry mustard, salt and pepper.
Using your clean hands, rub the mixture all over the chicken. Transfer the chicken into the bowl of the slow cooker.
Whisk together the Dijon mustard and honey in a bowl.
Pour ½ cup of the mixture over the chicken and make sure that the drumsticks are thoroughly coated with it. Reserve the rest.
Cook the chicken in low heat setting of your slow cooker until it is tender, 4-5 hours.
10 minutes before your chicken is fully cooked, pre-heat the oven to 450 degrees. Cover a baking sheet with aluminum foil and place a wire rack over it. Lightly spray the wire rack with vegetable spray.
Transfer the chicken to the prepared baking sheet. Brush the drumsticks with the half of the reserved honey-mustard mixture. Place in the oven and bake for 10-12 minutes or until the skin is lightly charred and crisp.
Flip the chicken, brush the drumsticks with the rest of the honey-mustard mixture and place it back in the oven. Continue to bake until the skin is lightly charred and crisp.
Serve over Uncle Ben’s flavored long grain wild rice.