To make these Peaches and Cream Whoopie Pies gluten-free, replace the all-purpose flour with a certified gluten-free 1:1 baking flour blend. Confirm that the baking powder, baking soda, powdered sugar, vanilla extract, cream cheese, peach schnapps, canola oil, heavy cream, brown sugar, cinnamon, salt, eggs, and peaches are gluten-free and free from cross-contact warnings. If using peach nectar or juice instead of schnapps, check the label as well. Use clean mixing bowls, measuring tools, baking sheets, parchment paper, spatulas, food processor parts, and cooling racks to prevent gluten contamination.