How to increase 2 stitches in 1 stitch together with yarn over

In this DROPS video we show how we increase with 2 stitches by knitting 2 stitches in the same stich + 1 yarn over.
Knit 1, but wait with slipping the stitch off the needle, 1 yarn over, knit 1 in same stitch, but in the back loop. On next round knit yarn over twisted to avoid holes (= 2 stitches increase).
We use the yarn DROPS Snow in the video.