To make sure this recipe's gluten-free make sure to read the labels on your cream cheese and bacon. Some brands might include additives or fillers that contain gluten. Also when selecting shredded cheddar cheese choose a certified gluten-free option. As always be sure to double-check all ingredient labels to ensure they are free of gluten or any possible cross-contamination. Enjoy your Jalapeño Popper Mushrooms that are completely gluten-free!