Preheat oven to 400 degrees. Season chicken with salt and pepper to taste and about 3 teaspoons Mediterranean seasoning on both sides. (see note)
Combine lemon sliced, red bell peppers, olives, onions, and capers in a bowl. Drizzle with oil and stir to coat. Sprinkle with remaining Mediterranean seasoning and stir to coat well.
Arrange chicken, lemon slices, red bell peppers, olives, onions, and cappers on a large, greased baking sheet.
Bake, uncovered, for 15--20 minutes until chicken is cooked through and veggies are tender. Top with cracked black pepper and fresh herbs (optional) and serve immediately.