Preheat the oven to 375°F.
Wash any fresh fruits and herbs with 1 gallon of water and 1/8 cup of white vinegar to remove debris and any insects that may be on the produce. Rinse under cool, running water.
Season the chicken with salt & pepper. (See Notes)
Heat the non-stick sauté pan over medium heat. Add 2 Tbsp. of oil and swirl the pan to evenly distribute the oil over the surface of the pan.
Place the presentation side (the best looking side of each cutlet) down onto the pan for 3-5 minutes, allowing it to brown. Once browned, place the chicken, presentation side up on a baking sheet pan.
Bake for 20-25 minutes or until the internal temperature has reached 155F. Pull the chicken and allow it to rest; the carryover heat will bring the final temperature to ~165F.
While the chicken is in the oven, heat a 3-qt. saucepan over medium-high heat and add the remaining 2 Tbsp. of oil to the pan, swirling to evenly coat the surface.
Add the diced shallots and sauté for 3-4 minutes until soft.
Add blackberries, chipotle pepper, brown sugar, and balsamic vinegar. Bring to a boil, reduce heat, cover and simmer for 10 minutes.
Remove sauce from heat and let cool for 5 minutes. Serve the sauce over the chicken and garnish with mint leaves.