Nana Margaret showed me this 3 ingredient trick years ago. Now I have to make two pans because the first one disappears instantly.

This 3-ingredient pistachio icebox cake is the exact shortcut my Nana Margaret showed me years ago. It’s the kind of no-bake dessert you throw together in a glass casserole dish after work, stash in the fridge, and somehow the first pan is gone before dinner dishes are even done. Layers of graham crackers soften into a cake-like texture between fluffy pistachio pudding and whipped cream, so you get that creamy, nostalgic, potluck-style dessert with almost zero effort. It’s perfect for busy weeknights, holidays, or whenever you need something sweet that feels homemade without taking over your whole afternoon.

Serve this pistachio icebox cake straight from the fridge so the layers stay cool and slice cleanly. I like to cut it into small squares and plate it with a few fresh berries or sliced strawberries for color. Coffee or hot tea balances the sweetness really well, and for a more casual vibe, just set the glass dish on the counter with a stack of plates and a spatula—people will help themselves. It’s a great make-ahead dessert for cookouts, potlucks, or Sunday dinners when the oven is already busy with the main meal.

Servings: 12

2 boxes (3.4 oz each) instant pistachio pudding mix

In a large mixing bowl, whisk together the instant pistachio pudding mix and cold milk for 2 minutes, until thick and smooth. Let it sit for 3–5 minutes to fully set.

Gently fold 8 oz (about half) of the whipped topping into the pistachio pudding until the mixture is light and fluffy. This will be your pistachio cream layer.

Spread a thin layer of the pistachio cream over the bottom of a 9x13-inch glass casserole dish. This helps anchor the first layer of graham crackers.

Arrange a single, even layer of graham crackers over the pistachio cream, breaking pieces as needed to cover the bottom of the dish completely.

Spread half of the remaining pistachio cream over the graham crackers, smoothing it into an even layer with a spatula.

Add another single layer of graham crackers on top of the pistachio cream, again covering the surface completely.

Spread the rest of the pistachio cream over this second graham cracker layer, smoothing the top.

Top with a final layer of graham crackers, pressing them gently into the pistachio cream so they stick but don’t sink.

Spread the remaining 8 oz of whipped topping evenly over the top graham cracker layer, creating a smooth, creamy surface.

Cover the dish tightly with plastic wrap or a lid and refrigerate for at least 4 hours, or overnight, until the graham crackers have softened into a cake-like texture and the layers are fully set.

When ready to serve, remove from the fridge, slice into squares, and serve directly from the glass casserole dish on the counter. Store any leftovers covered in the refrigerator for up to 3 days.

If your family loves nuts, you can sprinkle a handful of chopped pistachios over the top whipped layer before chilling for extra crunch and color. For a slightly lighter version, use sugar-free instant pistachio pudding and light whipped topping; just know the texture may be a bit softer. If you like things a little less sweet, swap some of the graham crackers with plain tea biscuits. To make it look extra pretty for holidays, reserve a spoonful of the pistachio cream and dollop or swirl it into the top whipped layer for a pale green marbled effect. You can also divide the recipe into two 8x8-inch pans instead of one 9x13—this is what I do when I know the first pan will disappear instantly, just like it did at Nana Margaret’s house.