Prep the chicken. Pat the chicken breasts dry and pound to an even thickness for faster, even cooking. Season both sides with salt, pepper, Italian seasoning, and garlic powder.
Sear and cook. Heat 1 tablespoon olive oil in a skillet over medium-high. Sear chicken 4–5 minutes per side, until golden and cooked through (internal temp 165°F/74°C).
Transfer to a plate and rest 5 minutes, then slice.
Assemble the greens. Add mixed greens to a large bowl or platter. Scatter tomatoes, cucumber, red onion, and torn basil over the top.
Add the mozzarella. Tear or slice the mozzarella and tuck it throughout the greens so every serving gets some.
Dress lightly. Drizzle the extra-virgin olive oil over the salad. Season with a pinch of salt and a few grinds of pepper to wake up the flavors.
Top with chicken. Arrange the sliced chicken over the salad.
Spoon any pan juices over the top for extra flavor.
Finish with balsamic glaze. Drizzle the glaze in thin ribbons across the chicken and mozzarella. A little goes a long way—aim for light, even coverage.
Taste and adjust. Add more basil, a pinch of flaky salt, or an extra splash of olive oil if needed. Serve right away.