In a large skillet over medium-high heat, heat oil.

Season chicken with salt and pepper and cook through until golden, 6 minutes per side. Transfer to plate.

Add balsamic vinegar to skillet to deglaze, then add garlic and stir until fragrant, 1 minute. Add tomatoes and season with salt. Let simmer until soft, 5-7 minutes.

Stir in basil.

Return chicken to skillet and nestle in tomatoes. Top with a slice of mozzarella and cover with lid to melt cheese.