Pumpkin crunch cake (also called pumpkin dump cake) is the fall dessert you make when you want something that tastes homemade without a lot of work. You mix a spiced pumpkin custard, pour it into a 9×13 dish, cover it with dry yellow cake mix, drizzle melted butter and finish with chopped walnuts. After an hour in the oven you get a creamy pumpkin bottom and a crunchy, buttery topping that tastes like streusel.
It uses pantry staples, bakes in one dish and cuts into 24 squares, so it is perfect for Thanksgiving, Friendsgiving and fall potlucks.
Why You’ll Love It
- True dump-cake ease. No mixer, no crust, no frosting.
- Creamy pumpkin under a crunchy top. The contrast is the whole point.
- Feeds 24. One 9×13 pan for potlucks, Friendsgiving or Halloween night.
- Make-ahead friendly. Bake it the day before; the topping stays crisp if you cool it uncovered.
- Pantry ingredients. Cake mix, canned pumpkin, evaporated milk and butter.
Ingredients and Substitutions
Full amounts are in the recipe card below.
- Pumpkin puree (1 can, 15 oz): Plain pumpkin only, not pumpkin pie filling. Libby’s or any solid-pack puree works.
- Evaporated milk (1 can, 12 oz): Gives the custard body. Do not use sweetened condensed milk.
- Eggs (3 large) and sugar (1 cup): Set and sweeten the pumpkin layer.
- Pumpkin pie spice (2 tsp) plus cinnamon (½ tsp): Warm and balanced. If you only have cinnamon, use 2 tsp cinnamon, ½ tsp nutmeg and ¼ tsp ginger.
- Yellow cake mix (1 box, 15.25 oz): Dry mix only. Spice cake mix works for a stronger spice flavor.
- Melted butter (1 cup / 2 sticks): Enough to soak the cake mix so you don’t get floury spots. Salted or unsalted both work.
- Chopped walnuts (1½ cups): Pecans are the classic swap. Toast them lightly for more flavor.
How to Make Pumpkin Crunch Cake
- Heat the oven. Set it to 350°F. Grease a 9×13-inch baking dish.
- Make the pumpkin layer. Whisk the pumpkin puree, evaporated milk, sugar, eggs, pumpkin pie spice and cinnamon until smooth. Pour into the dish and spread evenly.
- Add the cake mix. Sprinkle the dry cake mix evenly over the pumpkin. Do not stir. Break up any large clumps with your fingers so the butter can soak through.
- Butter and nuts. Drizzle the melted butter evenly over the cake mix, covering as much of the surface as you can. Scatter the walnuts on top.
- Bake. Bake 55 to 65 minutes, until the top is deep golden and a knife inserted near the center comes out mostly clean (a little moist pumpkin is fine).
- Cool completely. Cool in the pan on a rack for at least 2 hours before cutting into 24 squares. The pumpkin layer sets as it cools.
Tips for Success
Cover every bit of cake mix with butter
Dry, white patches mean the butter missed a spot. Pour slowly in a grid pattern, then tilt the pan so pooled butter runs into dry corners. A few pea-sized dry spots are normal; big chalky patches are not.
Cool before you cut
Hot pumpkin crunch cake will fall apart. Two hours at room temperature (or overnight, loosely covered after it cools) gives you clean squares.
Invert for a “crust on the bottom” look
Some families flip each square so the crunchy layer sits underneath like a crust. Both ways are correct.
Tent if the nuts brown early
If the walnuts are dark at 45 minutes but the center still jiggles a lot, lay foil loosely over the pan for the last 10 to 15 minutes.
Variations
- Pecan crunch: Swap walnuts for 1½ cups chopped pecans.
- Spice cake mix: Use spice cake mix and drop the extra ½ tsp cinnamon.
- Gluten-free: Use a 15.25-oz gluten-free yellow cake mix; bake time is the same.
- Half batch: Halve everything and bake in an 8×8-inch pan for 45 to 55 minutes.
- Serving ideas: Vanilla ice cream, lightly sweetened whipped cream or a dusting of cinnamon sugar.
Make-Ahead, Storage and Reheating
- Make ahead: Bake up to 1 day early. Cool completely, then cover loosely so the topping stays crisp.
- Room temperature: Covered, up to 1 day.
- Fridge: Up to 4 days in an airtight container. The topping softens a little.
- Reheat: Warm individual squares in a 300°F oven for 8 to 10 minutes, or microwave 20 to 30 seconds.
- Freezer: Wrap cooled squares tightly and freeze up to 2 months. Thaw in the fridge overnight.
Frequently Asked Questions
Is pumpkin crunch cake the same as pumpkin dump cake?
Yes. Same method: wet pumpkin layer, dry cake mix, butter and nuts. “Crunch” highlights the topping; “dump” highlights how easy it is.
Why is my topping powdery?
Not enough butter coverage, or the cake mix was piled too thick in spots. Use the full cup of melted butter and spread the mix in an even layer.
Can I use fresh pumpkin?
Yes, if it’s a dry, roasted puree. Measure 15 oz (about 1¾ cups) and avoid watery homemade puree or the custard won’t set.
Do I have to use evaporated milk?
It gives the best texture. Whole milk works in a pinch, but the layer will be a little looser.
Pumpkin Crunch Cake (Easy Pumpkin Dump Cake)
Ingredients
Equipment
Method
- Heat the oven to 350°F. Grease a 9×13-inch baking dish.
- Whisk the pumpkin puree, evaporated milk, sugar, eggs, pumpkin pie spice and cinnamon until smooth. Pour into the dish.
- Sprinkle the dry cake mix evenly over the pumpkin. Do not stir. Break up large clumps.
- Drizzle the melted butter evenly over the cake mix. Scatter the walnuts on top.
- Bake 55 to 65 minutes, until the top is deep golden and a knife near the center comes out mostly clean.
- Cool completely in the pan, at least 2 hours, then cut into 24 squares.
Notes
Save this recipe: Pin this pumpkin crunch cake for your next fall potluck or Thanksgiving dessert table.
