Step 1

Preheat the oven to 425 degrees F. Heat the olive oil in a large ovenproof skillet over medium-high heat. Season the chicken with salt and pepper and cook, skin-side down, until browned, about 5 minutes.

Step 2

Separate the heads of garlic into cloves but do not peel. Flip the chicken; add the garlic and rosemary to the skillet and transfer to the oven. Roast until the chicken is cooked through but still moist, 15 to 20 more minutes.

Step 3

Place the bread on a platter and top each slice with a chicken breast. Add the vinegar to the skillet and scrape up any browned bits with a wooden spoon. Add 3 tablespoons water and simmer until the sauce thickens slightly, about 2 minutes. Pour the sauce and garlic over the chicken and bread.

Step 4

Tip: You can squeeze the garlic out of its skin and spread on the chicken or bread.