Preheat oven to 400ºF.
Melt butter in a small pan or microwave.
In a shallow roasting pan, dress potatoes, apples and onions with melted butter, and season with salt, pepper and fresh thyme. Roast 10 minutes then remove from oven.
Dress chicken with EVOO, salt and pepper, and arrange over potatoes and onions.
Combine syrup, mustard, vinegar, Worcestershire, stock, garlic and shallot in a small bowl. Pour sauce evenly over the chicken and potatoes, and roast 1 hour more.