Crockpot Andes Mint Molten Fudge Cake

This Crockpot Andes Mint Molten Fudge Cake turns a box of cake mix and a stack of Andes mints into a dramatic, gooey dessert that feels like a bakery secret.

The dark chocolate cake bakes up tender and moist, while the center hides a molten mint-fudge lava that spills out with every scoop. It's the kind of dessert that makes everyone lean in for a closer look—and then reach for a spoon.

Slow cookers are for more than dinner. This dessert uses the gentle, even heat of a Crockpot to create a cake with a soft, pudding-like crumb and a center that stays gloriously molten.

The Andes mints melt into a rich, minty fudge that pools beneath the cake, while the hot water poured over the batter creates a steam-baked texture that's impossible to achieve in a standard oven. Serve it warm with cold mint chip ice cream for the ultimate contrast.

Ingredients

Why this recipe works

The slow cooker acts like a gentle, moist oven. The covered environment traps steam, which keeps the cake tender and prevents it from drying out.

The hot water poured over the batter doesn't get stirred in—it sinks and creates a pudding-like layer that bakes into the cake, adding extra moisture and a soft, almost custardy texture.

The Andes mints are pressed into the center of the batter. As they melt, they form a pocket of liquid mint fudge that stays molten even after the surrounding cake sets.

This creates the lava effect—every spoonful reveals a glossy, minty center that contrasts with the dark chocolate cake. The cocoa sugar sprinkled on top adds a subtle crunch and intensifies the chocolate flavor.

Notes and substitutions

Choose a high-quality dark chocolate cake mix for the deepest flavor. The peppermint extract is optional but amplifies the mint note; use a pure extract rather than artificial flavoring for the cleanest taste. The Andes mints are the star—make sure they are fresh and not stale, as they need to melt smoothly.

A 6-quart slow cooker is ideal for this recipe. If using a smaller cooker, the batter may be too thick and take longer to cook. The hot water must be added just before cooking—do not stir it in. The cake is best served warm, straight from the Crockpot, so have the ice cream ready.

• dark chocolate cake mix: Use a chocolate fudge or devil's food cake mix for a deeper cocoa flavor. Any chocolate cake mix works.
• peppermint extract: Substitute 2 tbsp crème de menthe liqueur for the extract, or omit it for a milder mint flavor.
• cocoa sugar: Mix 2 tbsp granulated sugar with 1 tsp unsweetened cocoa powder, or simply use granulated sugar.
• Andes mints: Use 28 mint chocolate thins or 1 cup mint chocolate chips. For a non-mint version, use semisweet chocolate chips.

Equipment

• 6-quart slow cooker (Crockpot)
• Mixing bowl
• Whisk
• Rubber spatula
• Measuring cups and spoons
• Small saucepan (for hot water)