Combine chocolate ice cream and half and half in a blender. Blend for 10 seconds until well mixed. Then add in the slice of red velvet cake. Blend for 5 seconds just until incorporated.
Divide the milkshake between two glasses. Top with whipped cream and red velvet cake crumbs. Enjoy!
Notes
Try this with any leftover cake you have. Is leftover cake a thing in your house??