
Wash and dry the lemon balm leaves. In a food processor, blend all the pesto ingredients together until smooth. If you need to make it thinner, add 1 extra teaspoon of oil at a time until you reach the desired consistence. Set aside.
Rub the olive oil on the chicken and season with salt and pepper. Brush the lemon balm pesto over the chicken breasts and grill the breasts until the internal temperature reaches 165℉. Keep brushing the pesto over the chicken as it cooks, and flip the breast over after the underside begins to brown. Serve immediately.