Take one piece of dough and flatten it into a circle. It shouldn’t be too thin or it will tear. Place it into a small round bowl (ideally one that is slightly smaller than the wrapper) and press it down gently.
Use a piping bag or spoon to add a layer of whipped cream, leaving about one inch border. Add a spoonful of Oreo crumbs, press down lightly, then top with more cream.
Pinch the edges of the mochi together from one point, just like you’re sealing a bao. Keep going until it is completely sealed. Cut off any extra dough if needed and dust with a little more cooked flour. Place seam-side down onto a muffin liner.
Repeat for the rest and place them in the fridge for about 30 minutes to firm up. You can also freeze them for a shorter chill time.