Converting these Christmas Turtle Bars into a gluten-free treat is surprisingly easy and doesn't compromise the taste or texture. Just replace the all-purpose flour with your gluten-free flour blend that can be substituted in a 1:1 ratio. It's best to choose a blend that contains xanthan gum since it helps replicate the texture and structure that gluten provides. While most of the ingredients are naturally gluten-free it's always a practice, to double check labels particularly, for the caramel bits and chocolate chips.