To make these delicious Pecan Butterballs gluten-free just replace the flour with your gluten-free flour blend. Find a blend that can be used as a substitute, in a 1:1 ratio to ensure your cookies retain their melt-in-your-mouth texture. Also remember to check that the pecans and other ingredients have not come into contact, with any gluten-containing products during processing so as to prevent any cross-contamination.