This tutorial is the blanket/buttonhole stitch referred to as scotch (Scottish)darning. At first it may seem difficult but when you get into the rhythm it’s actually really easy. I like that it has a crochet quality to the stitches✨👌🏼
Darning mushroom available here https://www.bookhou.com/collections/for-makers/products/mushroom
My visible mending book available here
https://www.bookhou.com/collections/for-makers/products/visible-mending-book