How To Piece Bernice
Today I'll show you how I would piece this block.
On the right I show the block broken down into pieces.
Set the center unit aside.
Sew 1"x 1" squares on the diagonal onto 3 corners of the 2 pieces. Trim them and folded them back, as above, to make triangles.
If you want blocks bigger than 6"x 6" you only need to change the size of the grid and use it to size the pieces, always remembering to add 1/4" seam allowances.