Midsummer Magic: Just 4 ingredients. I make it when I want a rich treat handled hours ahead of the backyard barbecue.

This 4-ingredient slow cooker vintage grasshopper cake is my midsummer magic trick: a rich, gooey chocolate-mint dessert that I can assemble in minutes and let the slow cooker handle while I get everything else ready for a backyard barbecue. It nods to the classic mid-century grasshopper pie and cocktail—those minty, chocolatey, slightly kitschy treats that were wildly popular in the 1950s and 60s—but streamlines the process with boxed cake mix and mint chocolate candies. The result is a dark, fudgy cake with molten mint-green pockets and caramelized edges, perfect for anyone who wants a nostalgic, over-the-top dessert made well ahead of time.

Serve this cake warm, scooped straight from the slow cooker into small bowls. A scoop of vanilla or chocolate-mint ice cream on top melts into the gooey pockets and makes it even more decadent. For a backyard barbecue, I like to pair it with grilled fruit—pineapple or peaches work especially well—to cut through the richness. Coffee, cold brew, or an after-dinner mint liqueur echo the flavors nicely, while unsweetened iced tea or sparkling water with lime helps balance all that chocolate and sugar.

Servings: 8-10

1 (15.25-ounce) box chocolate fudge cake mix

Lightly coat the inside of a 5- to 6-quart slow cooker with nonstick cooking spray or a thin film of neutral oil to prevent sticking and to help the edges caramelize rather than burn.

In a medium mixing bowl, whisk together the chocolate fudge cake mix, whole milk, and eggs until the batter is mostly smooth. A few small lumps are fine; overmixing can make the cake a bit tough.

Roughly chop the mint chocolate candies into small chunks—aim for a mix of pea- to marble-sized pieces so some fully melt into gooey pockets while others stay a bit more intact.

Fold about three-quarters of the chopped mint chocolate candies into the cake batter, reserving the remaining quarter for topping. Stir just until the candy is evenly distributed throughout the batter.

Pour the batter into the prepared slow cooker and gently spread it into an even layer with a spatula, making sure it reaches the edges so it cooks uniformly.

Sprinkle the reserved chopped mint chocolate candies evenly over the top of the batter. These will sink slightly as the cake cooks and form those glistening, melted mint-green pockets on the surface.

Cover the slow cooker with its lid. Cook on LOW for 2 1/2 to 3 hours, or until the edges are set, the top looks glossy and slightly puffed, and a toothpick inserted into the center comes out mostly clean with a few moist crumbs (you want it a bit gooey, not dry). Avoid lifting the lid during the first 2 hours to keep the heat steady.

Once done, turn the slow cooker to WARM and let the cake sit, covered, for up to 1 hour before serving. The residual heat will keep it molten and scoopable, and the edges will deepen in flavor as they gently caramelize.

To serve, scoop the warm cake directly from the slow cooker with a large spoon or small ladle, making sure to dig down to capture the fudgy center and the melted mint-green candy pockets. Serve plain or with ice cream, and keep the slow cooker on WARM for guests to help themselves over the course of the barbecue.

For a stronger vintage grasshopper vibe, you can replace 1/4 cup of the milk with crème de menthe liqueur, keeping the total liquid at 1 cup; this adds a more pronounced mint and a hint of that classic cocktail flavor. If you prefer a milder mint profile, use only 1 1/2 cups of candies and choose a brand with a softer, creamier center. For extra richness, stir in 1/2 cup of semisweet chocolate chips along with the candies. If you need this to be dairy-light, you can swap the whole milk for an unsweetened non-dairy milk with some body, like oat or soy; just know the crumb will be slightly less tender. A gluten-free chocolate cake mix works well here too—follow the same directions, but check for doneness around the 2-hour mark, as some gluten-free mixes cook a bit faster. To keep the dessert from overcooking once it’s done, switch the slow cooker fully off after 30–45 minutes on WARM if your unit runs hot; the ceramic insert retains heat for a long time. Food safety notes: always cook the cake on LOW rather than keeping it on WARM from the beginning—WARM is not hot enough to safely cook eggs and cake batter. Make sure eggs are fresh and the cake reaches a firm set around the edges. Leftovers should be cooled to room temperature within 2 hours, then transferred to a covered container and refrigerated for up to 3 days; reheat individual portions in the microwave until just warm. Avoid leaving the cake in the slow cooker on WARM for more than 2 hours after cooking is complete to reduce the risk of bacterial growth and to prevent the sugars from scorching.