Chicken Caprese

WHAT YOU'LL NEED

• 4 boneless, skinless chicken breast halves (about 1 1/4 lbs./625 g)
• 1 Tbsp. (15 mL) olive oil
• 1/2 cup (125 mL) finely chopped onion
• 1 large tomato, finely chopped
• 1 pot Knorr® Homestyle Stock Chicken
• 2/3 cup (150 mL) water
• 1/2 cup (125 mL) small cubes mozzarella cheese
• 2 Tbsp. (30 mL) thinly sliced fresh basil leaves