Amy Holland Droubay on Instagram: "Want a quick and easy way to make a smash cake for your little one’s birthday? Try using Costco’s giant muffins. I simply covered with frosting, sprinkles, swirls, and voilà! No baking required. **EDITED TO ADD: I do NOT leave the dowels/sticks in the cake! They are there to stabilize the cake while I frost and then I immediately take them out. Note: The cake had been in the freezer when I cut into it. It’s not dry. In fact, it was delicious! @costco…