Preheat the oven to 375°F Coat a 13" x 9" baking pan with cooking spray.
In a shallow bowl, combine the bread crumbs, tomatoes, and pepper. Spread the pesto on the top side of the chicken breasts, then dip in the bread-crumb mixture, pressing to coat evenly. Arrange the chicken, breast side up, in the prepared pan. Drizzle with the reserved tomato oil.
Bake for 40 minutes, or until a thermometer inserted in the thickest portion registers 170°F and the juices run clear.