Ready to make an incredibly easy and delicious Strawberry Rhubarb Dump Cake? Here’s a detailed, step-by-step guide:

1. Preheat Oven:

Preheat the oven to 350°F (175°C).

2. Combine Filling Ingredients:

In a large bowl, combine the chopped fresh or frozen rhubarb, quartered fresh strawberries, orange liqueur (or orange juice), sugar, ground cinnamon, ground nutmeg, and ground cardamom.

Toss gently to combine all the ingredients.

3. Transfer Filling to Baking Dish: Transfer the strawberry rhubarb filling to a greased 13×9-inch baking dish.

4. Add Butter to Filling: Drizzle 3 tablespoons of the melted butter evenly over the fruit filling.

5. Sprinkle Cake Mix: Sprinkle the dry spice cake mix evenly over the fruit filling and melted butter. Do not stir.

6. Top with Remaining Butter: Top the cake mix with the remaining melted butter, drizzling it evenly over the surface.

7. Bake:

Bake, uncovered, in the preheated oven for 45-55 minutes. Or until the topping is golden brown and the filling is bubbly.

8. Cool and Serve:

Let the cake cool on a wire rack for at least 15 minutes before serving. This allows the filling to thicken slightly.

Serve warm. Top with whipped cream, if desired. Enjoy your incredibly easy and delicious Strawberry Rhubarb Dump Cake!