Balsamic Chicken Breasts With Peppers and Onions

Season chicken with salt and pepper.
In a large skillet, saute chicken in 2 tablespoons of oil over medium high heat, turning once for a total of about 8 minutes or until golden brown.
Transfer chicken to a plate.
Add 2 remaining tablespoons of oil to the skillet and cook peppers and onions, stirring often until just softened.
Add garlic and stir for about 1 minute.
Stir in basil and vinegar and return chicken and juices to the skillet.
Reduce heat to low and simmer until chicken is cooked through, about 3 more minutes.
Taste and adjust salt and pepper seasonings.