My aunt brought this to our family reunion and everyone begged for her secret. Only 4 ingredients for the best dessert you will ever eat.

My Aunt Carol showed up to our family reunion one sticky July afternoon carrying this slow cooker pistachio Watergate cake, and I swear the whole crowd went quiet after the first bite. It’s soft, pale green, and studded with crunchy nuts, like the old-fashioned Watergate salad turned into a warm, spoonable cake. The best part—she finally admitted—is that it only takes four ingredients and a slow cooker, no fancy tricks. This is the kind of Midwest potluck magic our mothers and grandmothers leaned on: simple pantry staples, a little patience, and a dessert that has everyone begging for the recipe.

Serve this slow cooker pistachio Watergate cake warm right out of the crock, scooped into bowls like a pudding cake. It’s lovely plain, but a dollop of whipped topping or a small scoop of vanilla ice cream melts into all the little nooks and crannies. A few extra chopped pistachios or pecans sprinkled over the top add a nice crunch. It pairs well with hot coffee after Sunday dinner, or with iced tea or cold milk at a summer potluck. Let folks serve themselves straight from the slow cooker—part of the charm is how casual and comforting it feels.

Servings: 10-12

1 (15.25-ounce) box white cake mix

Lightly grease the inside of a 5- to 6-quart slow cooker crock with butter or nonstick spray. This helps the cake release easily and keeps the edges from getting too dark.

In a large mixing bowl, whisk together the dry white cake mix and both boxes of instant pistachio pudding mix until the powders are evenly combined and no streaks remain.

Pour in the cold whole milk. Using a spoon or spatula, stir until you have a thick, smooth batter. It will be denser than regular cake batter—more like a heavy pudding—that’s exactly what you want for the slow cooker.

Fold in 3/4 cup of the chopped pistachios (or pecans), reserving the remaining 1/4 cup for topping. Stir just until the nuts are evenly distributed through the batter.

Spoon the batter into the prepared slow cooker and spread it into an even layer, smoothing the top with the back of your spoon. Sprinkle the reserved 1/4 cup chopped nuts evenly over the surface for a crunchy topping.

Cover the slow cooker with its lid. Cook on LOW for 2 1/2 to 3 1/2 hours, or until the cake is set in the center. The top should look dry and spring back lightly when touched, and a toothpick inserted into the center should come out with a few moist crumbs but no wet batter.

Once done, turn off the slow cooker and remove the lid, tilting it slightly and leaving it ajar for about 15–20 minutes. This lets some steam escape and helps the cake set while staying moist and fluffy.

Serve the pistachio Watergate cake warm, scooping it straight from the slow cooker into bowls. If you like, add a spoonful of whipped topping, a drizzle of cream, or a bit of extra chopped nuts over each serving. Store any leftovers covered in the refrigerator for up to 3 days; reheat gently in the slow cooker or microwave before serving.

If you prefer a slightly richer cake, you can substitute part of the milk with half-and-half, but keep the total liquid amount the same so the batter doesn’t become too loose. For a deeper nut flavor, toast the pistachios or pecans in a dry skillet over medium heat for a few minutes until fragrant, then let them cool before chopping and adding to the batter. You can also use yellow cake mix in place of white if that’s what you have on hand; the flavor will be a touch more buttery and the color a bit warmer, but the pale green from the pistachio pudding will still shine through. For a softer top, stir all the nuts into the batter and skip the sprinkle on top; for extra crunch, add a few more chopped nuts right before serving so they stay crisp. Food safety tips: Always use pasteurized milk and check that your instant pudding mix is within its expiration date. Make sure your slow cooker is in good working order and cook on LOW as directed—cooking on HIGH can cause scorching around the edges before the center is safe and set. Once the cake is done, don’t leave it in the warm slow cooker for more than 2 hours; cool leftovers promptly, transfer them to a shallow covered container, and refrigerate. Reheat only the portion you plan to eat, and discard any cake that has been left at room temperature for more than 2 hours, especially in warm weather or at outdoor gatherings.