Liberally season both sides of the chicken with salt and pepper.
Heat the olive oil over medium-high heat in an oven safe skillet, and add the chicken breasts. Cook the chicken until seared brown, about 3 to 5 minutes on each side. Remove from heat.
Spread about 1 tablespoon of pesto over each chicken breast and place skillet in a preheated 400℉ oven for about 15 minutes, until the chicken has reached an internal temperature of 165℉.
Remove the skillet from the oven and add two slices of fresh mozzarella on top of each breast, then two slices of tomato each.
Place skillet on the center rack of the oven, and turn oven to broil. Watch closely, and remove when cheese is melted and bubbly (about 2 - 3 minutes).
If your skillet is not broiler safe, just return the skillet to the 400℉ oven and cook an additional 5 - 7 minutes until cheese is melted.
Drizzle the balsamic reduction over the chicken and sprinkle with the fresh basil.
Notes
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