Roast the sweet potatoes: Preheat oven to 425°F. Toss 2 cubed sweet potatoes, with 1 tbsp of the 3 tablespoons olive oil and a generous pinch of salt and pepper. Spread on a sheet pan and roast for 20–25 minutes, flipping once, until tender and caramelized at the edges. Set aside to cool slightly. (I do these on Sunday to have for the week.)
Grill the chicken: Heat your grill or grill pan to medium-high. Brush 1.5 pounds boneless skinless chicken breasts or thighs with 1 tbsp of the 3 tablespoons olive oil and season well with 1 salt and black pepper. Grill for 5–12 minutes per side until cooked through and nicely charred. Rest for 5 minutes, then slice on the bias.
Make the vinaigrette: 1/3 cup extra virgin olive oil, 2 tbs fresh lemon juice, 1 tbs white wine vinegar, 1 small glove garlic (finely minced or grated), 1 tsp fresh thyme, chopped, 1 tsp dijon mustard, 1 tsp honey, 1/4 tsp sea salt and pepper- to taste
Build the salad: Arrange 5 cups mixed greens or arugula on a large platter or in a wide bowl. Top with the sweet potatoes, sliced chicken, 1 cups fresh blackberries, 1 cups fresh blueberries, 0.3cups toasted pecans or walnuts, and 0.3 cups fresh mint or basil leaves, torn. Crumble 4 ounces goat cheese, crumbled over everything.
Dress and serve: Drizzle the vinaigrette over the top just before serving. Toss gently if you like, or leave it arranged and let everyone help themselves. Eat immediately.