Is it "Stack the Deck" by Karla Alexander? I saw it originally on "Simply Quilts" many years ago, so not sure if there is a YouTube video. But you stack at 6 pieces of fabric - then make cuts so you have six pieces. Then one stack you move one down, the next stack 2 down, the next stack 3 down, etc. Then you have all different pieces. How ever many you have in the stack is how many pieces you need to cut. Sew them together, then square them to the size. The book has several variations of it - I really like the hearts she centered on them. (It's still on my to-do list.)