How do you keep fruit crisps or crumb toppings from going soggy?

To keep fruit crisps or crumb toppings from going soggy, ensure that the fruit is well-drained and not overly juicy before baking. You can also add a layer of flour or cornstarch to the fruit filling to absorb excess moisture. Baking at a higher temperature for the initial few minutes can help set the topping quickly, and avoid covering the dish while it cools, allowing steam to escape. Lastly, serve the dish immediately after baking for the best texture.