There are a few different ways to keep cobbler from getting soggy. First of all, be sure to add cornstarch to the berries. The cornstarch will soak up any excess liquid that could make your cobbler soggy. Next, leave space between the dollops of cobbler topping to allow steam to escape. Finally, bake until the top is golden and crispy, and allow the cobbler to cool for 5-10 minutes before serving.