Maple Syrup Pork Chops

6 pork chops
vegetable oil (small amount for browning chops)
1/4 cup onion, chopped
1 tablespoon vinegar
1 teaspoon chili powder
1/2 teaspoon pepper
1/4 cup maple syrup
1/4 cup water
1 tablespoon worcestershire sauce
salt
flour (as needed to thicken the gravy)

Preheat the oven to 400°F.
Lightly brown the pork chops in a small amount of oil, then place them in a flat baking dish with sides.
Combine the other ingredients in a small saucepan and heat until warm; pour over chops.
Cover and bake for 45 minutes, basting occasionally.
Place the pork chops on a warming platter and pour the sauce into a saucepan.
Thicken it slightly with flour to make a gravy, salt to taste, and serve it over the chops.