Apple Pie Bars with Oat Streusel Topping
A three-layer dessert bar combining a buttery shortbread crust, spiced apple filling, and crispy oat streusel. Warm cinnamon and nutmeg spiced apples sit between tender cookie-like base and a crumbly oat topping. Serve these bars at potlucks, holiday gatherings, or casual weeknight desserts. This version layers distinct textures and builds flavor gradually, making it more interesting than traditional apple pie while staying simpler to execute.
Ingredients
- 1 cup salted butter, softenedunsalted butter + 1/4 teaspoon salt added to crust1:1vegan alt
adds structure, reduces sodium
Full guide → - 2 cups all purpose flour, for crust
- ½ cup powdered sugar, for crust
- 4 medium apples, peeled, cored, sliced thin
- ¼ cup all purpose flour, for filling
- ¼ cup granulated sugar, for filling
- 2 teaspoons ground cinnamon, for filling
- ¼ teaspoon ground nutmeg, for filling
- ¾ cup all purpose flour, for streusel
- ¾ cup old fashioned oats, for streuselquick oats1:1texture
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- ½ cup light brown sugar, for streusel
- ⅓ cup granulated sugar, for streusel
- ¼ teaspoon sea salt, for streusel
- ½ cup unsalted butter, melted, for streuselunsalted butter + 1/4 teaspoon salt added to crust1:1vegan alt
adds structure, reduces sodium
Full guide →
Instructions
- 1
Preheat oven to 350°F.
- 2
Line an 8x8 inch baking pan with parchment paper.
- 3
Combine flour, powdered sugar, and softened butter in a medium bowl, mixing until a soft dough forms.
- 4
Press dough evenly into the bottom of the prepared pan.
- 5
Bake for 20 minutes.
- 6
While crust bakes, combine apples, flour, granulated sugar, cinnamon, and nutmeg in a large bowl and mix well.
- 7
Remove crust from oven, wait 5 minutes, then spread apple mixture evenly over the warm crust.
- 8
In a medium bowl, combine oats, brown sugar, granulated sugar, sea salt, melted unsalted butter, and flour. Mix until combined.
- 9
Sprinkle streusel mixture evenly over the apple filling.
- 10
Bake for 35-40 minutes until golden.
- 11
Cool completely, then refrigerate for at least 2 hours or overnight.
- 12
Cut into squares and serve with salted caramel sauce.
Tips
Chill the dough briefly before baking if it becomes too warm or sticky. A firmer crust base prevents a soggy bottom layer.
Use tart apple varieties like Granny Smith or Honeycrisp. Mix varieties for complex flavor. Slice apples uniformly for even cooking.
Refrigerate overnight for easier cutting and better flavor development. The bars firm up significantly when fully chilled.
Good to Know
Covered container at room temperature for up to 3 days, or refrigerated for up to 5 days. Bars firm up when cold, making them easier to handle.
Prepare crust 1 day ahead and store covered at room temperature. Assemble and bake day-of for best texture. Fully baked bars refrigerate overnight before serving.
Serve chilled or at room temperature with salted caramel sauce drizzled or served on the side. Pairs with vanilla ice cream, whipped cream, or strong coffee.
Common Mistakes
Skip the 5-minute rest after baking the crust to avoid separating layers or uneven filling distribution.
Overbake streusel without monitoring at 35-minute mark to prevent dark, bitter topping.
Use thick-sliced apples without uniform thickness to cause uneven cooking and watery filling.
Substitutions
Vegan Options
adds structure, reduces sodium
Full guide →2
General Alternatives
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FAQ
Can I use a different pan size?
Yes. A 9x9 inch pan works well; reduce bake times slightly by 2-3 minutes per stage since bars will be thinner. A 9x13 inch pan increases bake time by 5 minutes for each stage. Adjust based on thickness.
What if my apples release too much liquid?
Toss apples with 1 tablespoon cornstarch or tapioca starch when mixing with sugar and spices. This absorbs excess moisture. Alternatively, drain apples in a colander for 15 minutes before layering on the crust.
How long can I keep these bars and can I freeze them?
Store covered at room temperature for 3 days or refrigerated for 5 days. Freeze unbaked assembled bars for up to 1 month (add 5 minutes baking time when baking from frozen), or baked bars for 2 months wrapped tightly.