Here are a few tips to prevent the bottom of your galette from getting soggy: 1. Preheat the baking sheet: A hot baking sheet will help the crust cook evenly and prevent it from becoming soggy. Preheat the sheet to the temperature specified in your recipe. 2. Use a parchment paper lining: Place a sheet of parchment paper on the baking sheet before adding the galette. This will help prevent the bottom crust from sticking and becoming soggy. 3. Avoid overfilling: Make sure not to overfill the galette with fruit. If the filling is too runny, it can leak out and make the bottom crust soggy.