Peach Crumble Bars
These bars are one of my favorite things to make during peach season. I made them for the first time on a whim with some peaches that needed to be used up and now they are a summer staple in our house.
Fresh summer peaches sandwiched between a buttery oat crumble base and a golden crumble topping, baked until the peach filling is jammy and bubbling and the top is perfectly crisp. These peach crumble bars have everything you want from a summer dessert in a handheld, easy-to-share bar format. Simple ingredients, one bowl for the crumble and one for the filling, and a result that tastes like significantly more effort than it is.
Why You'll Love This Recipe
One crumble mixture does double duty as both the base and the topping so there is minimal extra prep and almost nothing to clean up.
Fresh peaches with lemon juice and zest produce a bright, jammy filling that tastes specifically summery and fresh rather than overly sweet.
These bars hold together beautifully once cooled and are easy to slice, pack, and share which makes them ideal for cookouts, potlucks, and summer gatherings.
They keep well for several days and can be served at room temperature, slightly warm, or cold from the refrigerator depending on your preference.
Ingredients Needed to Make Peach Crumble Bars
The Crumble
Rolled oats add texture and a slightly chewy, nutty quality to both the base and the topping. All-purpose flour provides structure. Brown sugar adds a warm, slightly caramelized sweetness. Cinnamon adds warmth. Salt balances the sweetness. Vanilla adds depth. Melted and cooled unsalted butter binds everything into the sandy, clumped crumble texture.
The Peach Filling
Fresh yellow peaches peeled and diced are the star. Granulated sugar sweetens the filling slightly. Cornstarch thickens the peach juices during baking so the filling sets into a jammy, sliceable layer rather than a wet, runny one. Fresh lemon juice adds brightness. Lemon zest adds a more concentrated, aromatic citrus note.
How to Make Peach Crumble Bars
Two bowls, one 8x8 pan, 35 minutes of baking.
Step 1: Make the Crumble
Preheat the oven to 350°F. Line an 8x8 baking pan with parchment paper leaving an overhang on both sides for easy lifting after baking. In a large bowl, combine the rolled oats, flour, brown sugar, cinnamon, salt, and vanilla. Pour in the melted cooled butter and mix until the dry ingredients are evenly coated and the mixture clumps together when pressed between your fingers.
Step 2: Make the Peach Filling
In a separate bowl, combine the diced peaches, granulated sugar, cornstarch, fresh lemon juice, and lemon zest. Stir until every piece of peach is coated. Set aside.
Step 3: Build the Layers
Press approximately two thirds of the crumble mixture firmly and evenly into the bottom of the prepared pan using your hands or the bottom of a measuring cup. The base should be compact and even with no thin spots. Spread the peach filling evenly over the pressed crumble base. Scatter the remaining crumble mixture over the top of the peaches, distributing it as evenly as possible.
Step 4: Bake and Cool
Bake uncovered at 350°F for 30 to 35 minutes until the top is deeply golden brown and the peach filling is visibly bubbling at the edges. Remove from the oven and let cool completely in the pan for at least 1 full hour before cutting. The filling needs the full cooling time to set into a sliceable, cohesive layer.
Storing
Store in a sealed airtight container at room temperature for up to 2 days or in the refrigerator for up to 5 days. The bars firm up further in the refrigerator and many people prefer the texture cold. For longer storage, freeze individually wrapped bars for up to 2 months. Thaw at room temperature or microwave for 20 to 30 seconds.
How to Serve Peach Crumble Bars
Serve at room temperature, slightly warm with a scoop of vanilla ice cream on top, or cold from the refrigerator. A light dusting of powdered sugar over the top right before serving adds a simple, elegant finishing touch.
Frequently Asked Questions About Peach Crumble Bars
Can I use frozen or canned peaches?
Yes. Frozen peaches thawed completely and patted dry work well. Canned peaches drained very thoroughly and patted dry also work though they are softer and sweeter than fresh and produce a less vibrant result. Fresh yellow peaches at peak summer ripeness are always the best choice when available.
Why does the butter need to be cooled before mixing?
Hot melted butter dissolves the brown sugar immediately on contact and produces a wet, greasy mixture rather than the sandy, slightly clumped crumble texture that bakes into the crispy, defined base and topping layers. Letting the butter cool to room temperature before mixing allows it to coat the dry ingredients evenly without melting the sugar and produces the right crumble consistency.
Why do the bars need a full hour to cool?
The peach filling is essentially a jammy fruit sauce when it comes out of the oven. It needs the full cooling time to firm up and set into a sliceable layer that holds together cleanly when cut. Cutting too early produces bars that fall apart with runny filling rather than clean, defined layers. The hour is not optional for the best result.
Can I make these in a 9x13 pan?
Yes for a larger batch. Double all the ingredients and use the same technique. The bake time may increase slightly to 35 to 40 minutes depending on the thickness of the layers. Check for a deeply golden top and visible bubbling at the edges as the doneness indicators.
Can I substitute a different fruit for the peaches?
Yes. Fresh blueberries, diced strawberries, raspberries, or a combination of summer fruits all work with the same filling technique and the same cornstarch and lemon ratio. Adjust the sugar in the filling based on the sweetness of the fruit. More tart fruits like raspberries may need an extra tablespoon of sugar.
How do I get clean cuts when slicing the bars?
Use the parchment paper overhang to lift the entire cooled slab out of the pan and onto a cutting board before slicing. Use a sharp knife and wipe the blade clean between each cut. Cutting directly in the pan produces less clean edges. Refrigerating the bars for 30 minutes before cutting produces even cleaner, more defined slices than cutting at room temperature.
Peach Crumble Bars
Ingredients
Method
- Preheat the oven to 350°F. Line an 8x8 baking pan with parchment paper.
- In a large bowl, combine the rolled oats, flour, brown sugar, cinnamon, salt, vanilla, and melted cooled butter. Mix until well combined and the mixture looks like a crumbly, slightly clumped dough.
- In a separate bowl, combine the diced peaches, granulated sugar, cornstarch, lemon juice, and lemon zest. Stir until the peaches are evenly coated. Set aside.
- Press about two thirds of the crumble mixture firmly and evenly into the bottom of the prepared pan to form the base layer.
- Spread the peach mixture evenly over the crumble base.
- Scatter the remaining crumble mixture evenly over the top of the peaches, covering as much of the surface as possible.
- Bake uncovered at 350°F for 30 to 35 minutes until the top is golden brown.
- Let cool completely in the pan for at least 1 hour before cutting into bars. Do not cut early or the bars will fall apart.
Notes
- Let the butter cool before mixing it into the crumble. Hot butter melts the brown sugar and produces a wet, greasy mixture rather than the sandy, clumped crumble texture you want.
- Press the bottom crumble layer firmly and evenly. A well-packed base holds the bars together cleanly when cut.
- The full 1-hour cool is non-negotiable. The peach filling needs time to set completely before the bars can be sliced without falling apart.
- Adjust the lemon zest to your preference. More zest produces a more pronounced citrus note alongside the peach. Less keeps the peach flavor front and center.
