Roast: Preheat oven to 350°F (176°C). Toss to combine cherry tomatoes, mango, and oil on a parchment paper-lined baking sheet. Roast for 8 to 10 minutes, or until tomatoes have burst.
Assemble: Combine roasted tomatoes and mangoes with basil, salt, and pepper. Serve over toasted bread, drizzled with balsamic reduction.