Rub salt and pepper on chicken.
Leave for 30 minutes to tenderize.
Preheat oven to 400 degrees.
Heat oven safe skillet over medium high temperature.
Add olive oil and when hot, add chicken.
Brown chicken on both sides and remove from skillet.
Add broth, wine, syrup, thyme and garlic.
Cook over medium heat for 2 minutes, stirring frequently.
Add vinegar and mustard, cook for an additional minute, stirring frequently. Add chicken back to the skillet.
Spoon sauce over chicken and roast in oven for 10 minutes.
Remove chicken and let stand for 5 minutes.
Cook and stir sauce over medium heat, on the stove top, for another minute, and then pour over chicken.