4 boneless, skinless chicken breast halves (about 1-1/4 lb.)
1 Tbsp. olive oil
1/2 cup onion, finely chopped
1 large tomato, finely chopped
1 tub Knorr® Homestyle Stock - Chicken
3/4 cup water
1/2 cup small cubes mozzarella cheese (about 2 oz.)
2 Tbsp. thinly sliced fresh basil leaves
Heat oil in 12-inch nonstick skillet over medium high heat and cook chicken, turning once, 3 minutes.
Stir in onion and tomato and cook, stirring occasionally, until onion is tender, about 3 minutes.
Add water and Knorr® Homestyle Stock - Chicken to skillet and stir until Stock is melted. Bring to a boil over high heat. Reduce heat to low and simmer until chicken is thoroughly cooked, about about 3 minutes. Arrange chicken on serving platter.
Stir in cheese and basil and cook until cheese begins to melt, about 1 minute. Serve sauce over chicken.