And I use ONE layer of padding (fleece, insul brite) because my potholders are 2 layers of fabric (padding between) then layers of 4 squares (folded in half) fabric over that. (put 4 folded pieces around all sides-raw edges together, fold to center, overlap the 4 just like closing a cardboard box) A pair requires 12 squares @ 9". Sew all around, trim, turn right side out.
I make lots from "not so quilt-worthy" fabric and donate to a charity that deals in setting up households for the needy. There is a tutorial but I don't know what it's called.