To make these Peanut Butter and Oat Granola Bites gluten-free, use certified gluten-free rolled oats, as regular oats are often processed on shared equipment with wheat. Confirm that the sunflower seeds, pistachios, dried cranberries, dried blueberries, ground flaxseed, peanut butter, honey, vanilla extract, and salt are labeled gluten-free. Check dried fruit and peanut butter carefully, as some brands may contain gluten-based additives or cross-contact warnings. Use clean mixing bowls, measuring tools, parchment paper, baking sheets, and storage containers to prevent gluten contamination.