Preheat oven to 425°F. Using a small sharp knife cut into the thick end of the chicken and make an incision reaching 2/3 the way down the breast. Loosen up the incision with your fingers to make a hole. Season the chicken with pepper. Combine the cheese with arugula and baby spinach and stuff the breasts. Spiral-wrap the breasts with the bacon tightly to cover the meat evenly. Place chicken on a nonstick baking sheet and roast 20-22 minutes until bacon is crispy and chicken is firm.