My Homemade Ice Cream Cake is no-bake, easy to prep, and layered with fudge, crumble, and whipped cream—just like Dairy Queen, only better!
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a medium bowl, combine the crushed Oreos with the melted butter, then spread evenly on the prepared baking sheet.
Bake for 10 minutes, then let cool to room temperature
Line a 9-inch (23 cm) springform pan with 2 sheets of plastic wrap in opposite directions and with enough length to hang over the edges.
Let the vanilla ice cream sit at room temperature for 10 minutes, then transfer to a large bowl and stir it until it is evenly soft enough to spread but still frozen.
Spread the ice cream into the prepared pan, then spread the chocolate cookie filling on top, pressing down lightly into the ice cream.
Drizzle the hot fudge sauce over the cookie crumbs and freeze the cake for at least 1 hour.
Let the chocolate ice cream sit at room temperature for 10 minutes, then transfer to a large bowl and stir it until it is evenly soft enough to spread but still frozen.
Take the cake from the freezer and spread the chocolate ice cream on top.
Fold the overhanging plastic wrap over the chocolate later, pressing down to cream and even surface. Freeze for at least 2 hours.
In the bowl of a stand mixer fitted with a whisk attachment (or with a large bowl and a handheld electric mixer) whip the cream and powdered sugar on medium-high speed to stiff peaks, about 5 minutes.
Release the sides of the pan, unwrap the cake and invert it onto a serving plate so that the chocolate layer is on the bottom.
Quickly frost the top and sides of the cake with the whipped cream, then decorate with piped rosettes (if desired), cherries, and sprinkles.
Return the cake to the freezer for at least 4 hours (and up to 4 days) before serving.