The card is a standard 4.25 x 5.5 and I just sliced an inch or so off one end and stamped on the exposed piece on the inside. I used Liquid Applique on the whipped cream and heat set it with my heat tool to make it puff up. I have not found Liquid Applique locally. You'll have to order it online. I found it at Archivers when I was in Louisville, KY last year.
The scallop is a larger version of Stampin Up's scallop punch. I used my Wishblade to make it bigger.
Stampin Up supplies used: Real Red, Very Vanilla, Close to Cocoa cardstock, DSP is ?? I can't remember the name!!, Ribbon is 5/8 wide grosgrain in Chocolate Chip, ink is Chocolate chip and Real red.