Peach Dump Cake
This easy peach dump cake takes four ingredients and zero mixing - but the whole recipe lives or dies on one step: the butter. I retested this recipe with a full cup of chilled butter, sliced an eighth of an inch thin and laid so every slice touches the one beside it, and that's the difference between a golden, buttery topping and the dry, powdery patches most dump cakes are known for. My first version used less butter, and it simply wasn't enough to cover a 9x13 pan.
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Why This Peach Dump Cake Works
If you've ever made a dump cake that came out with dry, floury patches on top, it wasn't your oven and it wasn't the cake mix - it was butter coverage. The dry mix only turns into a golden cobbler-style topping where melting butter reaches it. Anywhere the butter doesn't touch stays powder.
That's why this recipe calls for a full cup of butter, sliced thin enough that the slices tile the entire surface of the pan edge to edge. I tested this with three-quarters of a cup first, and no matter how carefully I arranged the slices, there were gaps - and every gap turned into a dry spot. One cup, sliced about ⅛ inch thick, is what it actually takes to cover a 9x13-inch dish completely.
Beyond that, it's the peach cobbler experience with a fraction of the work - and because it uses canned peaches, you can make it in the middle of January just as easily as peak peach season.
Ingredients You'll Need
- Canned sliced peaches (two 15-ounce cans): Drain one can completely and leave the other undrained. That ratio matters - I tested it. All the syrup makes a soggy cake; none of it leaves pockets of dry cake mix.
- Yellow cake mix (one box): Straight from the box - do not prepare the batter. Butter or white cake mix works too if that's what's in the pantry.
- Salted butter (1 cup / 16 tablespoons, chilled): This is the amount it genuinely takes to cover a 9x13 pan. Chilled matters more than you'd think - cold butter slices thin and clean, and thin slices are how you tile the whole surface.
- Ground cinnamon (1 teaspoon): Sprinkled over the peaches. It's the one addition that makes this taste homemade instead of from a box.
How to Make Peach Dump Cake
Step 1: Prep the pan. Preheat the oven to 350°F and lightly grease a 9x13-inch baking dish.
Step 2: Layer the peaches. Pour in the undrained can of peaches (syrup and all), then the drained can. Spread the slices into an even layer and sprinkle the cinnamon over the top.
Step 3: Add the cake mix. Sprinkle the dry cake mix evenly over the peaches so no fruit is showing. Use the back of a fork to gently press the mix down so it makes contact with the syrup - do not stir. Dump cakes only work if the layers stay layered.
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Step 4: Cover with butter. This is the step that makes or breaks the whole dessert. Slice the full cup of chilled butter into thin slices - about ⅛ inch thick - and lay them across the entire surface so that each slice is touching the one beside it, edge to edge, corner to corner. Any spot the butter doesn't reach will stay dry and powdery. It takes the whole cup to tile a 9x13 pan; if you run out of butter before the pan is covered, your slices are too thick - re-slice a few of them thinner, or add an extra tablespoon or two to close the gaps. A little extra butter never hurt a dump cake; a bare patch always does. (Add the pecans now if using.)
Step 5: Bake. Bake for 45 to 50 minutes, until the top is golden brown and the peach syrup is bubbling up around the edges. Let it rest 15 minutes before serving - the filling thickens as it cools.
Serve it warm with a scoop of vanilla ice cream. That part is not optional in our house.
Using Fresh Peaches
In July and August, fresh peaches are a wonderful swap. Peel and slice about 6 cups of ripe peaches, toss them with ⅓ cup of sugar, and let them sit for 30 minutes so they release their juices - that stands in for the canned syrup. Then proceed with the recipe exactly as written, including the full cup of butter on top.
Variations
- Peach pecan: Scatter ½ cup chopped pecans over the butter before baking.
- Spice cake swap: A box of spice cake mix in place of yellow leans this toward fall flavors - keep the cinnamon.
- Peach berry: Replace the drained can of peaches with 2 cups of fresh or frozen blueberries for a peach-blueberry version.
👩🍳 Tips from My Kitchen
I've made this dump cake more times than I can count, and I went back and retested the topping specifically because "why is my dump cake powdery" is the number one complaint I see on recipes like this one. Here's what the testing actually showed.
- The butter amount is not negotiable. I originally made this with ¾ cup of butter and no matter how I arranged the slices, there were gaps - and every gap baked into a dry, floury patch. A full cup, sliced about ⅛ inch thick with every slice touching its neighbor, covers the pan completely. That retest is why this recipe now calls for 16 tablespoons.
- Chill the butter first. Cold butter slices thin and clean. Room-temperature butter smears and tears, and you'll never get slices thin enough to tile the whole pan.
- One can drained, one undrained. I tested this both ways. All the syrup from both cans makes the bottom soggy; draining both leaves dry pockets of cake mix that never hydrate. One of each is the ratio that works.
- Do not stir - press. The layers have to stay layered. Pressing the dry mix gently with the back of a fork gets it in contact with the syrup without mixing it in.
- Spot a bare patch mid-bake? You can still save it. If you peek in and see a spot the butter missed, pull the pan out and use the back of a spoon to spread the softened, melting butter over the gap, then return it to the oven. The butter is spreadable within the first 10-15 minutes of baking, so check early - it's a two-second fix that rescues the whole topping.
- Family verdict: Carly taste-tested the ¾-cup and full-cup versions side by side and called the full-cup topping "the whole point of the dessert." She wasn't wrong.
Frequently Asked Questions
Why is my dump cake dry and powdery on top?
Butter coverage. The dry cake mix only turns golden and cobbler-like where melting butter reaches it. Use a full cup of chilled butter sliced about ⅛ inch thick, and lay the slices so each one touches the next across the entire pan - no gaps. If you notice a bare spot early in the bake, pull the pan out and spread the melting butter over the gap with the back of a spoon, then keep baking.
Do you mix the cake mix with anything first?
No. The cake mix goes on dry, straight from the box. The peach syrup from below and the butter from above hydrate it in the oven. Preparing the batter first would make this a regular cake, not a dump cake.
Can I use fresh peaches instead of canned?
Yes. Use about 6 cups of peeled, sliced ripe peaches tossed with ⅓ cup of sugar, rested for 30 minutes so they release their juices. That juice stands in for the canned syrup.
Can I make peach dump cake ahead of time?
It's best the day it's baked, while the topping is crisp. You can assemble the peach layer ahead and refrigerate it, but add the cake mix and butter just before baking - the mix turns gummy if it sits on the fruit too long.
How to Store Leftovers
Cover and refrigerate for up to 4 days. Reheat individual portions in the microwave, or re-crisp the topping in a 350°F oven for about 10 minutes. I don't recommend freezing - the topping loses its texture.
More Easy Fruit Desserts
Looking for more easy fruit desserts? Give these reader favorites a try:
Peach Dump Cake
Ingredients
- 2 15 ounce cans sliced peaches in heavy syrup one can drained, one can undrained
- 1 13.25 ounce box yellow cake mix dry
- 1 cup salted butter chilled — thinly sliced, about ⅛ inch thick
- 1 teaspoon ground cinnamon
Instructions
- Preheat oven to 350°F. Lightly grease a 9x13-inch baking dish.
- Add the undrained can of peaches (with syrup) and the drained can of peaches to prepared baking dish. Spread evenly; sprinkle with cinnamon.
- Sprinkle dry cake mix evenly over the peaches. Gently press with the back of a fork so it contacts the syrup. Do not stir.
- Thinly slice the full cup of chilled butter about ⅛ inch thick and lay the slices across the entire surface so each slice touches the one beside it — edge to edge, corner to corner. Any gap bakes into a dry, powdery patch. It takes the whole cup to cover a 9x13 pan; if you run out before the pan is covered, the slices are too thick — re-slice a few thinner, or add an extra tablespoon or two to close the gaps.
- Bake at 350° F for 40–50 minutes until golden brown and bubbling at the edges. Rest 15 minutes. Serve warm with vanilla ice cream.
