01 -
Preheat the oven to 350°F. Grease an oven-safe skillet generously with nonstick cooking spray.
02 -
Place the chicken breasts in the prepared skillet. Dollop 1 tablespoon pesto onto each piece and then rub it all over to fully coat the chicken.
03 -
Top each chicken breast with 3 mozzarella slices and a few tomato slices. Arrange the cherry tomatoes in the skillet around the chicken. Drizzle with olive oil and season with salt and pepper.
04 -
Transfer the skillet to the oven and bake until the cheese is melted, the tomatoes are soft and the chicken is fully cooked, 20 to 22 minutes.
05 -
While the chicken cooks, bring a large pot of salted water to a boil. Add the spaghetti and cook until al dente (or according to the package instructions). Drain the pasta, then toss with the remaining pesto.
06 -
To serve, divide the pasta among four plates and top each serving with a piece of chicken. Drizzle each plate with ½ tablespoon balsamic vinegar and garnish with fresh basil.