Slice the mozzarella. Divide the mozzarella ball into quarters, then cut the quarters into ½” slices.
Slice the peaches. Halve the peaches and remove the pits. Divide each half into 4 wedges and slice the wedges into halves or thirds, depending on size. Aim for 1” bite-sized pieces.
Slice the tomatoes. Core the tomatoes then slice in half. Divide each half into 4 wedges and slice the wedges into halves or thirds, depending on size. Aim for 1” bite-sized pieces.
Tear or roughly chop the basil leaves.
Combine the mozzarella, peaches, tomatoes, and basil in a large salad bowl. Drizzle with the olive oil then season with salt and pepper. Gently toss until well combined.
Drizzle with balsamic reduction, if using, and serve immediately.
