To make these Starbucks Lime Frosted Coconut Bars gluten-free. Simply substitute the all-purpose flour. With a gluten-free flour blend. Ensure the blend you choose. Contains xanthan gum. Or add a teaspoon yourself. To help with the texture. And binding. Check that all other ingredients. Such as the extracts. And chocolate chips. Are certified gluten-free. Following these adjustments. You can enjoy the same deliciously tropical flavors. Without any gluten!