Bake or prepare your cake base, then let it cool completely.
Line a springform pan with parchment paper or plastic wrap.
Place the cake layer at the bottom of the pan.
Let the ice cream sit out for 10–15 minutes until soft enough to spread.
Spread a thick layer of softened ice cream over the cake.
Add cookie crumbs, fudge, or caramel if you want an extra layer.
If using a second cake layer, place it on top and cover with more ice cream.
Smooth the top, cover with plastic wrap, and freeze for 4–6 hours (or overnight).
Once frozen, remove from the pan and frost with whipped cream.
Decorate with sprinkles, fudge drizzle, or crushed cookies.
Let it sit at room temperature for 5 minutes before slicing.
Slice with a warm knife and serve immediately.