Rhubarb Dump Cake

Rhubarb dump cake is the classic Midwestern springtime dessert that turns garden rhubarb into a brightly colored, sweet-tart crowd-pleaser with almost zero effort. The technique is right there in the name: dump the rhubarb in a pan, sprinkle with sugar and gelatin, scatter on marshmallows, top with cake batter, and bake. No measuring, no fussy assembly, no hovering over the stove.

Raspberry gelatin is the unexpectedly brilliant addition. As the rhubarb breaks down in the oven, the gelatin dissolves into the fruit juices and turns the whole thing a vivid pink color while adding a fruit-forward flavor that complements the rhubarb’s tartness. The mini marshmallows melt into gooey pockets that scatter through the fruit layer, providing chewy contrast against the soft fruit and tender cake above.

The finished cake comes out of the oven with a golden crust on top, a saucy sweet-tart filling beneath, and almost no work behind it. Serve warm with whipped cream or a scoop of vanilla ice cream that melts into every fold.

Pro Tips

• Use fresh rhubarb if available. Frozen works in a pinch but adds extra moisture, so drain it well first or extend the bake time.
• White cake mix gives the cleanest, most rhubarb-forward result. Yellow cake mix works but its richer flavor competes with the fruit.
• Try strawberry or cherry gelatin for different color and flavor variations. Strawberry-rhubarb is a classic pairing.
• Let the cake rest 15 to 20 minutes after baking before serving. The fruit layer thickens slightly and the cake firms enough to scoop cleanly.

Variations

• Add 1 cup of fresh strawberries with the rhubarb for a strawberry-rhubarb dump cake variation.
• Sprinkle ½ cup chopped pecans or walnuts over the cake batter before baking for added crunch.
• Substitute graham cracker crust mix for white cake mix on top for a graham-crusted variation.