Ingredients For the Salad: 4 boneless, skinless chicken breasts 2 tablespoons olive oil Salt and freshly ground black pepper, to taste 6 cups mixed salad greens (e.g., spinach, arugula, and baby kale) 1 cup fresh blackberries 1/4 cup red onion, thinly sliced 1/4 cup pecans, toasted (opt…