Supplies *contains affiliate links*:
-A piece of batting that is 40.5″ x 42″
-1.5 yards flannel
-1.5 yards coordinating flannel.
Then using your rotary cutter and cutting mat, cut a straight edge around the entire quilt to clean up the edges. Then sew a seam all the way around the blanket with a 3/4″ seam allowance. When you are done one side will have all of the seams on it and the other will look like a finished quilt.