My grandmother brought this to our summer block party and it vanished in minutes. Just 3 ingredients for the most nostalgic sweet treat of the season.

This slow cooker 3-ingredient orange creamsicle cake is the kind of nostalgic sweet my Midwestern grandmother would proudly carry to a summer block party—and watch disappear in minutes. It leans into that classic creamsicle flavor so many of us grew up with: bright orange and vanilla cream, swirled together in a fluffy, gooey cake you can scoop straight from the crock. Using just an orange soda, a boxed vanilla cake mix, and a tub of cream cheese frosting, you get those marbled orange-and-white layers and a glossy glaze without ever turning on the oven, which makes it especially appealing for hot-weather gatherings or busy weeknights.

Serve this orange creamsicle cake warm right from the slow cooker, scooped into bowls like a cobbler. It pairs beautifully with a scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream to echo the creamsicle vibe. For a little contrast, add fresh orange segments or berries on the side. Coffee, black tea, or an icy glass of milk all work well, but a simple sparkling water with a slice of orange keeps things light if you’re already feeling sugared out from the party spread.

Servings: 10-12

1 (15.25-ounce) box vanilla or white cake mix

Lightly coat the inside of a 5- to 6-quart slow cooker with nonstick cooking spray or a thin layer of neutral oil to help the cake release and prevent sticking.

In a large mixing bowl, combine the dry vanilla cake mix and the orange soda. Stir with a spatula or whisk just until the batter is mostly smooth and no large dry pockets remain; a few small lumps are fine. The soda will fizz at first, then settle into a pourable batter.

Spoon about 1 cup of the frosting into a small microwave-safe bowl and set the rest of the frosting aside at room temperature. You’ll use both portions later to create the marbled cream layer and the glaze.

Pour roughly two-thirds of the orange cake batter into the prepared slow cooker, spreading it into an even layer. This will be your bright orange base.

Microwave the 1 cup of frosting in 10- to 15-second bursts, stirring between each, until it is just pourable but not hot—think thick, warm cream. Carefully drizzle this warmed frosting over the orange batter in the slow cooker, trying to keep it mostly in the center and avoiding the very edges to reduce burning.

Gently spoon the remaining orange cake batter over the frosting in several dollops. Use the tip of a butter knife or a skewer to lightly swirl the top layer of batter and the frosting together, creating a marbled orange-and-white pattern. Do not overmix; you want visible streaks of both colors.

Cover the slow cooker with its lid, placing a clean kitchen towel or a double layer of paper towels under the lid if you like to catch condensation and keep the top of the cake from getting soggy. Cook on LOW for 2 1/2 to 3 1/2 hours, or until the cake is puffed, the edges are set, and a toothpick inserted into the center comes out mostly clean with a few moist crumbs. Every slow cooker runs a bit differently, so begin checking at the 2 1/2-hour mark.

While the cake finishes cooking, warm the remaining tub of frosting to make a glaze. Transfer it to a microwave-safe bowl and heat in 10- to 15-second bursts, stirring between each, until it is smooth and pourable but still thick enough to cling to a spoon.

Once the cake is done, turn off the slow cooker and remove the lid. Let the cake cool, uncovered, for about 10 to 15 minutes; this helps it set slightly while still staying warm and gooey.

Drizzle the warmed frosting evenly over the top of the cake while it is still warm, letting it sink into the crevices and form a glossy, sweet glaze. If you’d like more visible marbling on top, you can lightly drag a knife through the frosting while it’s still soft.

Serve the cake warm, scooping it directly from the slow cooker with a large spoon. Store any leftovers, once cooled, covered in the refrigerator for up to 3 days. Reheat individual portions gently in the microwave before serving.

To lean even harder into the creamsicle nostalgia, use a classic white cake mix and a full-sugar orange soda; the color contrast is more pronounced and the flavor is bolder. If you prefer a slightly more complex citrus note, try substituting half of the orange soda with orange juice, keeping the total liquid amount the same, though the cake may be a bit denser. For a tangier finish, you can use cream cheese frosting as written or mix a spoonful of orange zest into the warmed frosting before drizzling it on top. If you want a lighter, less sweet dessert, use only half of the frosting as a glaze and save the rest for another recipe. For a creamsicle sundae effect, scoop the warm cake into bowls and top with vanilla ice cream and a quick sauce made by whisking a splash of orange soda into a spoonful of leftover frosting until it’s pourable. Food safety tips: Use regular (not diet) soda for best structure; some artificial sweeteners can affect how the cake sets. Make sure the cake reaches a safe internal temperature (at least 190–200°F in the center for a fully set crumb) if you are concerned about doneness; slow cookers vary, so cooking time is a guideline. Avoid lifting the lid frequently during cooking, as this can drop the temperature and extend the time in the food “danger zone.” Once the cake is cooked and cooled, refrigerate leftovers within 2 hours because of the frosting and the moist texture. Reheat leftovers only until warm and avoid leaving the slow cooker on the “warm” setting for more than 2 hours once the cake is finished to minimize food safety risks.