Saw this type of cut on YouTube and just had to try it
Take traditional card however on the front you put it in your trimmer at 3" and place your cutting blade at the 5/8" mark and cut down to the 3" mark.
Turn the card to the inside (traditional opening and make the cut again.
Flip the wedge you sliced down and you get the corner flip. Add a bit of adhesive to keep the flip down to the base. The pattern paper is 2 3/4" x 2 3/4"
The leaves are a die set from Lawn Fawn, and the Thank you sentiment dies are from Tim Holtz