Place a stainless steamer on the burner at low heat.
Place 1/2 of the onions, carrots, and garlic, along with the chopped up fennel stems, peppers and tomatoes and sautée at low temperature.
When your onions turn soft and translucent about 3 minutes, add chicken stock and white wine and increase heat and allow mixture to come to a boil. Meanwhile toss all remaining ingredients in a bowl. Season with salt and pepper arrange the chicken in the steamer basket first and top the chicken with the vegetables except the potato which you need to put in the sauce to cook.
Place steamer basket over the steaming liquid cover the top and let cook for 10 minutes.
Chef’s Note: Make sure there is enough room between your chicken breasts for the steam to penetrate evenly.