White chocolate is made from sugar, cocoa butter, milk, and vanilla -- all ingredients that don't contain gluten. So in general, the Ghirardelli white chocolate baking bar that I used for these blondies should be fine for a more casual gluten-free diet -- however! If you are very gluten-sensitive or if you're concerned about cross-contamination, be sure you check your labels for white chocolate baking bars or white chocolate chips marked gluten-free.