Pound the chicken fillets to Paillard thickness, ~ 7mm, and keep aside.
Place in a bowl the Zucchini, the green and colored Bell Peppers, Tomatoes, Scallions, garlic, the olive oil, the vinegar, 1 teaspoon of Salt and the pepper and toss. Keep aside.
Lightly brush the chicken with olive oil, season with the remaining salt and set a grilled cast iron plate on medium-high heat. Cook the chicken for 3-4 minutes per side without moving them and plate each paillard to a plate.
Add the Basil, Parsley and Tarragon to the tomato salad and toss. Discard the smashed garlic and add the tomato salad on top of and next to the paillards.