Line 12-cavity cupcake tin with cupcake papers.
Place Oreo cookies in a food processor or blender process until fine crumbs are formed. Add butter and pulse a few more times to bring mixture together.
Divide cookie crumbs evenly between 12 cupcake papers and press down to tightly pack cookie crumbs. Place cupcake tin in freezer for about 15 minutes.
While cookie crusts are chilling, remove ice cream from freezer and let it soften for about 15 minutes. Add a scoop of softened ice cream over each cookie crust, filling cupcake papers almost to the top. Using the ice cream scoop, gently press down and smooth the tops. Place cupcake tin in freezer for at least 30 minutes.
Spoon about 1 ½ Tbsp of fudge sauce over the top of the ice cream, smoothing the top as best you can (if your fudge sauce has hardened too much to spoon, you can place it in the microwave for 30 seconds to soften it). Place cupcake tin in freezer for another 30 minutes.
Pipe a little whipped cream over each ice cream cupcake. You can do this immediately before serving or right after the fudge has hardened as whipped cream should hold its shape when frozen (just make sure you have room in your freezer to chill with the height of the whipped cream). Top with sprinkles and little strawberries, if desired.