Preheat oven to 375.
Combine brown sugar, mustard, and garlic in a shallow bowl. Toss chicken in mixture, coating on all sides. Arrange chicken in greased pan.
For boneless chicken thighs, bake at 375 for 20-25 minutes or until done.
For bone-in thighs, bake 45-50 mins.
When 10 minutes remaining, remove chicken from oven and top each piece with a pat of butter (1/2 T each). Return chicken to oven and finish baking.
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