Drain the roasted pepper pieces on kitchen paper and place in a baking dish. Place the chicken breasts on top and cut a few times with a sharp knife (not all the way through). Sprinkle the chicken breasts a little with salt and pepper. Mix the sour cream and pesto in a bowl and add the garlic (cut into small pieces or squeezed through). Mix everything together well. If you want this mixture a little more liquid, you can mix in a little cream, milk or coffee cream. Then distribute the mixture on the chicken breasts, also in the notches. Bake in the oven (about 200 degrees) for about 20-25 minutes.