Mix brown sugar, mustard, and soy sauce together in a bowl. Measure 1/4 cup marinade for basting and transfer to a small bowl; cover and refrigerate.
Place wings in a large resealable bag. Pour remaining marinade over wings, coating well. Seal and marinate wings at least 2 hours and up to overnight.
Preheat oven to 375 degrees F (190 degrees C).
Remove chicken wings from resealable bag and transfer to a baking sheet. Discard marinade.
Bake in the preheated oven for 30 minutes. Baste wings with reserved 1/4 cup marinade; cook, basting every 10 minutes, until chicken is no longer pink in the center, about 30 more minutes.
The nutrition data for this recipe includes the full amount of the marinade ingredients. The actual amount of the marinade consumed will vary.
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