To make this Butter Toffee Pretzels Recipe gluten-free, simply replace the regular pretzel snaps with certified gluten-free pretzels. Many brands now offer gluten-free pretzel crisps made from rice or corn flour that work well in this recipe. Additionally, check that the Heath toffee bits and other packaged ingredients are labeled gluten-free, as some brands may process them in facilities that handle wheat products. The rest of the ingredients are naturally gluten-free, making this an easy recipe to adapt.