Brown Butter Peach Crumble Bars Recipe

These peach crumble bars are a late-summer favorite: juicy sliced peaches tucked between a buttery, chewy brown-butter shortbread crust and a golden brown-sugar oat crumble. The secret that lifts them above the ordinary is brown butter—used in both the base and the topping for a warm, toasty depth in every bite.

Part peach cobbler, part shortbread cookie, these bars are the summer sibling to classic fruit crumble bars and are ideal for picnics, potlucks, or a simple afternoon treat.

Why You’ll Love This Recipe

• Brown butter magic — brown butter adds a warm, nutty undertone that appears as tiny amber specks throughout the crust and topping.
• Contrasting textures — a chewy shortbread base, tender spiced peaches, and a crisp oat crumble create the perfect bite.
• Perfectly sliceable — chilling the bars yields clean edges for neat squares. They are delicious both cold and slightly warmed with ice cream.

Ingredients

Main components at a glance:

• Unsalted butter. Start with extra butter since browning concentrates the fat and evaporates water.
• All-purpose flour. Used in the crust, filling, and crumble to give structure and thicken the peach juices during baking.
• Sugars. A combination of granulated and light brown sugar keeps the filling balanced and the crumble tender.
• Spices. Cinnamon and a touch of nutmeg highlight the peaches’ natural sweetness.
• Rolled oats. Thicker rolled oats add chew and texture to the crumble topping.
• Peaches. Choose ripe but still-firm peaches, sliced (skin on is fine). Toss with sugar, spices, and a little flour before layering.

See the recipe section below for full ingredient quantities and measurements.

Substitutions and Variations

• Swap in any stone fruit: nectarines, plums, apricots, or pitted cherries work well.
• Add ½ cup chopped pecans, walnuts, or almonds to the crumble topping for extra crunch.
• Quick oats can be used in a pinch, though rolled oats give a better texture.
• For a gluten-free version, use a 1:1 gluten-free baking flour blend.

How to Make This Recipe

One: Brown the butter over medium heat until the milk solids are amber and fragrant, then transfer to a bowl and chill until it reaches room temperature or a stiff peanut-butter-like consistency.

Two: Whip the cooled brown butter until pale and slightly fluffy, then add brown sugar, vanilla, salt, and the flour to form a shortbread dough.

Three: Scatter dollops of dough across a parchment-lined 9×13-inch pan and press with your fingertips into an even layer. Par-bake the crust briefly to set it.

Four: While the crust cools, slice 4–5 medium peaches about 1/8″ thick and toss them with flour, granulated sugar, cinnamon, and nutmeg.

Hot tip! Add the dough to the pan in dollops and press in with your fingertips for an even, rustic crust.

Five: Arrange a third of the crumble topping over the par-baked shortbread, then layer the peach slices in overlapping rows, gently pressing them into the crust.

Six: Mix the crumble topping by combining flour, brown sugar, rolled oats, salt, and melted brown butter until crumbly. Reserve one third for the middle layer.

Seven: Sprinkle the remainder of the crumble over the peaches and bake until golden and bubbling, about 30 minutes. Allow to cool completely on a rack.

Eight: Chill the bars in the refrigerator for several hours to set. Use the parchment sling to lift the slab from the pan, then cut into squares.

Expert Tips

• Cool your browned butter until it reaches a thick, spreadable consistency before using it in the crust for the best texture.
• Choose peaches that are ripe but firm so they keep their shape through baking.
• Press the peach slices gently into the crust to help them nest and cook evenly.
• Chill fully before slicing to achieve clean, neat pieces.

Recipe FAQs

Storage

Store the bars lightly covered in the refrigerator for 3–4 days. They are enjoyable straight from the fridge or warmed slightly. To freeze, wrap tightly and store for 2–3 months; thaw in the fridge before serving.

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What to Know When Cooking From This Recipe

• The recipe uses kosher salt as the standard; if you use a finer table salt, reduce the amount accordingly.
• Baking by weight with a digital scale yields the most consistent results—convert measurements if desired.
• Adjust the recipe quantity as needed; increasing quantities may require longer baking time.

Recipe: Brown Butter Peach Crumble Bars

Equipment

• 9×13-inch pan
• Parchment paper
• Stand mixer with paddle attachment or handheld mixer
• Mixing bowls

Ingredients (full list)

• Butter for browning: 1 ¾ cups (3 ½ sticks) unsalted butter
• Shortbread base:
  • 1 cup browned butter, room temperature
  • ½ cup light brown sugar, packed
  • 2 teaspoons vanilla paste or extract
  • ¼ teaspoon kosher salt
  • 2 cups all-purpose flour
• Peach layer:
  • 4–5 medium peaches, halved, pitted, and sliced 1/8″ thick
  • ¼ cup all-purpose flour
  • ¼ cup granulated sugar
  • 2 teaspoons ground cinnamon
  • ½ teaspoon ground nutmeg
• Crumble topping:
  • 1 cup all-purpose flour
  • 1 ½ cups light brown sugar, packed
  • 1 cup rolled oats
  • ¼ teaspoon kosher salt
  • ½ cup browned butter, melted

Instructions

1. Browning the butter: Cut butter into pieces and brown over medium heat, stirring occasionally, until the milk solids are amber. Transfer to a bowl and chill, stirring every 10 minutes, until the butter reaches a thick, spreadable consistency.
2. Prepare the shortbread base: Preheat oven to 300°F. Line a 13×9-inch pan with a parchment sling. Whip 1 cup room-temperature browned butter in a mixer on high for about 4 minutes until pale. Add ½ cup light brown sugar, 2 teaspoons vanilla, and ¼ teaspoon kosher salt; mix 1 minute. Add 2 cups flour and mix on low until combined. Scatter dough in dollops across the pan and press into an even layer. Bake 15 minutes, then cool. Increase oven temperature to 350°F.
3. Prepare the peaches: Core and slice peaches 1/8″ thick. In a large bowl, toss peaches with ¼ cup flour, ¼ cup granulated sugar, 2 teaspoons cinnamon, and ½ teaspoon nutmeg until evenly coated.
4. Make the crumble: Combine 1 cup flour, 1 ½ cups light brown sugar, 1 cup rolled oats, ¼ teaspoon salt, and ½ cup melted browned butter with a fork until crumbly.
5. Assemble and bake: Sprinkle one-third of the crumble over the par-baked shortbread. Arrange peach slices in slightly overlapping rows and press gently. Sprinkle remaining crumble evenly over the peaches. Bake at 350°F for about 30 minutes until golden and bubbling.
6. Cool and chill: Cool completely on a wire rack, then refrigerate for at least 2–4 hours to set. Lift the slab from the pan using the parchment sling and cut into squares.

Notes

• Brown the butter up to three days ahead and refrigerate; bring to room temperature before using.
• Use peaches that have a little give but are not overly soft to avoid a mushy filling.
• Peach skins may be left on for ease; peel if you prefer a smoother appearance.
• Store covered in the fridge for 3–4 days. Serve cold or warmed slightly with vanilla ice cream.