Cake Mix Recipe #3. Piecing Made Easy! Each Cake Mix Pad with 44 recipe cards will make 810, 2" x 2" finished half square triangles. Paper Piecing. Foundation Piecing. These wonderful paper recipe cards make sewing half square triangles SO easy. You start with Layer Cake squares, or any 10in square of fabric, and these sew-on pattern papers allow you to not only minimize waste, but help to make your sewing as accurate as possible! Each pre-printed recipe page includes diagrams of where to sew and where to trim. Use design suggestions included in the package, or create your own blocks!