Step 1: Place a baking sheet lined with parchment paper in the freezer for 10 minutes to chill.
Step 2: Carefully separate the Oreo cookies into halves. You can keep the cream filling on one side or scrape it off if you prefer.
Step 3: Let the vanilla ice cream sit at room temperature for about 5 minutes until it is slightly softened and easy to scoop.
Step 4: Using a small ice cream scoop or tablespoon, place one generous scoop of ice cream onto the flat side of 12 cookie halves.
Step 5: Place the remaining 12 cookie halves on top of the ice cream and press down gently until the filling reaches the edges.
Step 6: If desired, roll the edges of the oreo ice cream sandwiches in sprinkles or mini chocolate chips.
Step 7: Place the assembled sandwiches back on the chilled baking sheet and freeze for at least 2 hours before serving.