Let's whisk away the wheat and welcome a gluten-free twist to these Apple Pie Bars with Salted Peanut Butter Caramel without a whisper of compromise in taste or texture. Begin with your base, opting for gluten-free oat flour that behaves beautifully beneath your fingers, just like its traditional counterpart, and ensure your oats are certified gluten-free to keep every crumb safe and satisfying. As you layer on the apple slices, let the natural sweetness and spice sing their melody, untouched and glorious in their gluten-free state. The pièce de résistance, a peanut butter caramel drizzled with care, remains unchanged, because true decadence knows no bounds.