Set the oven to 350°F (175°C). Lightly grease a 9×13-inch glass casserole dish.
2. Layer the filling
Spread the blackberry pie filling evenly across the bottom of the dish.
3. Add the cake mix
Sprinkle the dry cake mix evenly over the berries.
4. Drizzle the butter
Pour the melted butter over the top, covering as much as you can. Small dry spots are okay—they create a slightly crumbly texture when baked.
5. Bake
Bake for 35–45 minutes, until the top is golden brown and the blackberry juices bubble at the edges.
6. Cool and serve
Let the cake rest 10–15 minutes so the filling thickens slightly. Scoop into bowls, making sure each serving has both berries and crust. Serve as is or with ice cream or whipped cream.
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