In a zip lock bag (ah, one of those things people bring me from the states), add the following:Olive oil, Soy Sauce (if you can), minced garlic, a little white wine, salt and a teaspoon of Dijon mustard.
Add chicken breast (de-boned) and let it marinate in the frig for a minimum 2 hours.
Heat the oven at 375 degrees (190 Celsius) for 15 minutes.
Place the marinated chicken on wax paper (carta al forno here in Italy) in a cookie sheet or thin pan. Use the extra marinate on top of the chicken then add a sliced red onion (tropea are my favorite) and sliced cherry tomatoes.
Cook for 22 minutes.