Cut two squares and put them right sides together.
Draw diagonal between the two corners.
Stitch 1/4" on each side of the line.
Cut down the pencil line.
Voila!! Two HSTs, no bias edges!!!!
I always make mine a little larger and then trip to size using the sewn seam to square up with. That way they are precise .... and give me the accuracy when joining them into blocks!!
If you need multiples ..... just draw the required number of squares on a larger piece of fabric. Add the diagonals. Stitch and then cut on the grid lines as well as the diagonals. Then square and trim.
Easy peasy for a multitude of HSTs in no time!