Preheat oven to 350 degrees.
Wash turkey well and pat dry. Season the turkey breast well on both sides with salt and pepper. Place turkey meat side down into baking pan or roaster. Using a basting brush, liberally brush butter over entire surface of turkey on both sides. Pour about 1/2 cup chicken broth into bottom of pan.
Place turkey into preheated oven and bake uncovered until golden brown, according to the instructions on package. If skin begins to brown too much, cover with foil.
Remove turkey to cutting board, cover with foil and let it rest for 15 minutes. Pour about 1 cup chicken broth into bottom of baking pan and loosen any juices or bits that may have accumulated during baking. Pour these drippings into a medium large saucepan and add the jars of gravy. Whisk to combine and heat until hot and bubbly. The drippings and broth will give the gravy a homemade taste.
Remove foil from turkey and cut meat from one side of bone, in one piece. Slice meat into even slices, keeping slices together. Place on serving platter and repeat with other side of breast. Garnish with parsley and clusters of grapes. Serve immediately. Makes 8 servings plus leftovers. Enjoy!