Ingredient substitutions: You can substitute the all-purpose flour for gluten-free flour if needed. For a dairy-free version, try using almond milk and a dairy-free whipped topping. Optional variations: Add chocolate chips or nuts to the batter for added texture or sprinkle some sea salt over the ganache for a sweet-salty flavor. Store any leftovers in an airtight container at room temperature for up to 3 days.