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Ice Cream Sheet Cake

Ice cream sheet cake with an Oreo crust and layered vanilla and chocolate ice cream, finished with a whipped topping canvas. Built in a 12x18 sheet pan for easy crowd feeding and no-bake slicing into party-size squares.
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Prep Time 20 minutes
freezing 6 hours
Total Time 6 hours 20 minutes
Servings: 24 servings
Course: Dessert
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

Oreo cookie crust
  • 48 Oreo cookies Crushed into fine crumbs.
  • 1 stick unsalted butter Melted.
Ice cream layers
  • 0.5 gallon vanilla ice cream Softened until spreadable.
  • 0.5 gallon chocolate ice cream Softened until spreadable.
Hot fudge and topping
  • 2 cup hot fudge sauce Use warm/hot for easier drizzling.
  • 16 oz whipped topping Two tubs (8 oz each), thawed.
Decorations
  • 0.25 cup Colorful sprinkles Add generously for a party look.
  • 1 gel frosting For piping decoration.

Equipment

  • 1 sheet pan

Method
 

Make the Oreo crust
  1. Press crushed Oreo cookies and melted unsalted butter firmly into a 12x18 sheet pan to form an even crust layer. Place the pan in the freezer for 20 minutes until set (visual cue: crust looks firm to the touch).
  2. Spread softened vanilla ice cream over half of the crust. Spread softened chocolate ice cream over the other half so the two flavors meet in the middle for a neapolitan effect (visual cue: distinct halves with a straight center seam).
  3. Drizzle hot fudge sauce over the ice cream layers in an even coating. Freeze for 4 hours to firm up the fudge (visual cue: surface looks set and scoopable).
  4. Cover the entire top completely with whipped topping, smoothing to fully seal the edges. The surface should look like a solid, white layer (visual cue: no ice cream or fudge peeking through).
  5. Decorate with colorful sprinkles and gel frosting piping to mimic a decorated birthday cake. Freeze at least 2 more hours before slicing into squares (visual cue: topping is firm enough to cut cleanly).

Notes

Pro tip: soften the ice cream just until spreadable—if it melts too much, the layers can blur; freeze between layers so each section firms before the next. Store covered in the freezer up to 7 days. Freezing works well: freeze leftovers up to 2 months (best texture within the first month). For a dairy-free swap, use non-dairy vanilla/chocolate ice creams and a dairy-free whipped topping; the layering and freezing steps stay the same.