Preheat oven to 350˚F | 175°C. Place berries and mango slices in an 8-inch baking dish. Add the flour, sugar and vanilla; mix through to evenly coat.
In another medium bowl, combine the oats, flour (or almond meal), coconut (if using), honey, butter, sugar and salt together. Mix well.
Top with the oat mixture evenly covering the fruit. Bake for 35-40 minutes, or until the fruit starts to bubble and the crumble is golden and crisp. Serve immediately with ice cream, frozen yogurt, or plain.