My aunt swears by this bright and simple trick using only 4 ingredients layered at the bottom. It miraculously bakes into a tender sponge over a rich custard that smells absolutely amazing.

This slow cooker 4-ingredient lemon pudding cake is the kind of quiet little miracle my aunt has sworn by for years. You simply layer four humble ingredients right in the bottom of the crock, put the lid on, and walk away. By the time the house smells like a sunny bakery, those layers have turned into a tender, lemony sponge floating over a warm, rich custard sauce. It reminds me of the old church-supper pudding cakes folks used to bake in glass dishes, but this one lets the slow cooker do all the work while you go about your day.

Serve this lemon pudding cake warm, straight from the slow cooker, so the bright yellow sponge and silky custard are still steaming. It’s lovely in small bowls with a spoonful of the sauce ladled over the top. A dollop of lightly sweetened whipped cream or a scoop of vanilla ice cream makes it extra special. For a simple country supper, I like to pair it with a light main dish—baked chicken or a pot of vegetable soup—so there’s room to really enjoy dessert. A cup of hot coffee or tea alongside balances the sweet-tart lemon just right.

Servings: 6

1 box (about 15.25 ounces) yellow cake mix

Lightly grease the bottom and sides of a 4- to 6-quart slow cooker crock with butter or nonstick spray so the cake releases easily and the edges brown nicely.

In a medium bowl, whisk together 1 can of sweetened condensed milk, 1/2 cup of the lemon juice, and 1 tablespoon of the lemon zest until smooth. This will be your rich lemon custard base.

Pour this lemon custard mixture into the bottom of the slow cooker and spread it into an even layer, making sure it completely covers the bottom. This is the first layer that will form the sauce.

In another bowl, pour the dry yellow cake mix. Add the remaining 1/2 cup lemon juice and remaining 1 tablespoon lemon zest directly to the dry mix. Stir with a spoon or spatula just until everything is evenly moistened and no dry pockets of mix remain. The batter will be thick.

Gently dollop the lemon cake batter over the custard layer in the slow cooker, then carefully spread it out to the edges in an even layer. Do not stir the two layers together; keeping them separate is the little trick that gives you cake on top and pudding underneath.

Drizzle the second can of sweetened condensed milk evenly over the top of the cake batter. It will sink down in spots as it cooks, helping create an extra-creamy lemon sauce under the tender sponge.

Cover the slow cooker with its lid. Cook on HIGH for 2 to 2 1/2 hours, or on LOW for 3 1/2 to 4 hours, until the top is set, puffed, and lightly browned around the edges. The center should spring back lightly when touched, even though there will still be a soft custard underneath.

Once done, turn off the slow cooker and let the pudding cake rest, covered, for about 10 to 15 minutes. This helps the layers settle into a fluffy sponge on top and a thick, spoonable lemon sauce on the bottom.

To serve, spoon down through both layers so each portion has some of the bright yellow cake and plenty of the warm lemon custard. Serve straight from the crock while it’s still steaming and fragrant.

For a slightly lighter texture, you can reduce the sweetened condensed milk to 1 1/2 cans and add 1/2 cup water to the custard layer, keeping the same layering method so you still get sponge over pudding. If you prefer a stronger lemon bite, increase the lemon zest by an extra teaspoon or two, or use all fresh-squeezed lemon juice. Around the holidays, a pinch of nutmeg or a little grated ginger stirred into the custard layer gives a cozy twist without adding extra ingredients to the list. You can also adjust the cooking time based on your slow cooker—older models may need an extra 30 minutes, while hotter, newer ones might finish on the earlier side, so check for a set, springy cake top and bubbling edges. Leftovers keep well in the refrigerator; rewarm gently in the slow cooker on LOW or in the microwave, and the pudding layer will loosen back into a creamy sauce.