Step 1

For the confetti cups: Line each cup of a 12-cup muffin pan with a cupcake liner.

Step 2

Process 15 of the vanilla sandwich cookies into crumbs in a food processor. Add the melted butter, then mix to combine. Press the crumbs into the cupcake liners. Set aside.

Step 3

Crush the remaining 4 vanilla sandwich cookies into chunks. Mix the softened ice cream with the crushed vanilla cookies and sprinkles in a bowl. Spoon into the cupcake liners.

Step 4

For the toppings: Press the rainbow sprinkles and chocolate shavings into the top of each cup. Freeze until firm, at least 2 hours.

Step 5

Remove the confetti cups from the muffin pan (leaving on the cupcake liners) and place in a single layer in resealable bags or other airtight containers.

Step 6

To serve, peel off the liners and place each one on a plate. Top with sweetened whipped cream if you'd like. You can also just serve them in the liners.