To make two entrees: Slice 1 zucchini, chop 2 Roma tomatoes and clean 4 to 8 green onions, saving the white and mostly pale green parts for the recipe.
Cut heavy duty foil into 12 to 15 inch long pieces. One per entree. Drizzle a a little EVOO on the center of each piece of foil and place a boneless, skinless chicken breast on each. Spread each breast with a tablespoon of pesto. Pile the half of each veggie on each chicken breast, starting with zucchini and ending with green onions.
Spread another 2 to 3 tablespoons of pesto on top of each one. Bring foil up and seal top then sides to make a leak proof packet. Place packets on a baking sheet and bake in a preheated 355 degree F oven for about 35 to 40 minutes. (You can also cook these on your grill using indirect method, grill preheated to medium. Close grill when cooking for about 25 minutes.