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Apple Crisp Shortbread Bars

Apple crisp shortbread bars with a buttery press-in base and spiced apple filling, topped with reserved oat crumble for a golden finish. Baked until the apples bubble, then cooled completely for clean sliceable layers.
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Prep Time 25 minutes
Cook Time 45 minutes
Total Time 1 hour 10 minutes
Servings: 16 servings
Course: Dessert
Cuisine: American
Calories: 310
Ingredients Equipment Method Notes

Ingredients
  

For shortbread base (doubles as crumble)
  • 2 cup all-purpose flour
  • 1 cup rolled oats
  • 1 cup brown sugar, packed
  • 1 tsp cinnamon
  • 0.5 tsp salt
  • 1 cup cold unsalted butter, cubed
For apple filling
  • 4 large apples, peeled and thinly sliced
  • 0.3333333333 cup granulated sugar
  • 1.5 tsp cinnamon
  • 0.25 tsp nutmeg
  • 2 tbsp cornstarch
  • 1 tbsp lemon juice
  • 1 Caramel sauce for serving

Equipment

  • 1 sheet pan

Method
 

Preheat and prepare pan
  1. Preheat oven to 375F. Line a 9x13 pan with parchment so the bars lift out cleanly.
Make the shortbread base (and reserve topping)
  1. Mix flour, rolled oats, brown sugar, cinnamon, and salt until evenly combined. Break up any brown sugar clumps so the crumble bakes uniformly.
  2. Cut in cold unsalted butter until the mixture looks like coarse crumbs. Keep the butter cold so the base stays tender after baking.
  3. Reserve 1 cup of the crumb mixture for the topping. Set it aside so it’s ready to scatter on the apples.
  4. Press the remaining mixture firmly into the prepared pan. Pack it down with even pressure for a solid shortbread layer.
  5. Bake for 12 minutes at 375F until the edges look set. The base should stay pale but firm to support the apples.
Assemble and bake
  1. Toss the apple slices with granulated sugar, cinnamon, nutmeg, cornstarch, and lemon juice. Coat thoroughly so the juices thicken into a glossy filling.
  2. Layer the apple mixture over the hot base. Distribute evenly so every bar gets apples from edge to edge.
  3. Scatter the reserved crumble over the apples. Cover the surface in an even layer so it bakes into a crisp top.
  4. Bake 30-35 minutes at 375F until the topping is golden and apples are bubbling. Look for visible bubbling at the edges and set crumble browning.
Cool and serve
  1. Cool completely before slicing. Slice only after cooling so the layers hold and don’t smear.
  2. Drizzle with caramel sauce to serve. Finish with a zigzag for the caramel look in the cross-section.

Notes

For the cleanest bars, let the pan cool fully at room temperature before slicing; if you’re in a hurry, refrigerate 1-2 hours to firm up the shortbread. Store covered in the refrigerator up to 4 days; the topping can soften slightly over time, but flavor stays strong. Freezing is yes—freeze bars in a single layer, then bag, up to 2 months and thaw overnight in the fridge. For a lighter swap, use half the butter (replace with an equal amount of solid plant-based butter) for a reduced-saturated-fat option while keeping the crumble texture.