Place 2 squared fabric pieces right sides together and sew all around the square. My squares here are 9 X 9 inches.
Be sure to align the ruler from stitched corner to corner.
Cut one of the triangles along the Red Line I photoshopped onto the picture. In real life, just use your ruler and cutting mat lines.
Open them all, finger-press or iron and arrange as desired , here as a pinwheel.
There - 4 fast and easy easy easy HST's with no fuss - no chain piecing, no drawing, no double line sewing.