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Freshly baked strawberry oatmeal crumble bars on a wooden table

Strawberry Oatmeal Crumble Bars

These strawberry oatmeal crumble bars feature a buttery oat crust filled with bright strawberries, making them a nostalgic and snackable treat perfect for any occasion.
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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings: 9 bars
Course: Dessert, Snack
Cuisine: American
Calories: 200
Ingredients Method Notes

Ingredients
  

For the crust and topping
  • 1/2 cup unsalted butter (melted) Use unsalted to control salt level.
  • 1 cup all-purpose flour Regular flour for classic crust; can substitute with whole wheat for nuttier flavor.
  • 3/4 cup old-fashioned oats Gives chew and structure; avoid quick oats.
  • 1/2 cup granulated sugar Regular granulated sugar.
  • 1/4 cup light brown sugar (packed) Adds depth of flavor.
  • 1/2 teaspoon salt Adjust to taste.
For the filling
  • 2 cups coarsely chopped fresh strawberries Fresh strawberries provide the best flavor.
  • 1/3 cup granulated sugar For sweetening the filling.
  • 2 tablespoons lemon juice Brightens flavor.
  • 2 teaspoons cornstarch Thickens the filling.

Method
 

Preparation of the crust and crumble
  1. Preheat the oven to 350°F. Line an 8-inch square pan with aluminum foil and spray with cooking spray.
  2. In a large, microwave-safe bowl, melt the butter. Add flour, oats, granulated sugar, brown sugar, and salt, mixing until dry and sandy with some larger crumble pieces.
  3. Set 1 heaping cup of this mixture aside for topping. Transfer the remaining mixture to the prepared pan and pack it firmly to create an even crust.
Making the strawberry filling
  1. In a bowl, toss chopped strawberries with 1/3 cup granulated sugar, lemon juice, and cornstarch. Let sit for 10–15 minutes.
  2. Spread the berry mixture evenly over the packed crust.
Baking
  1. Scatter the reserved crumble mixture evenly over the strawberry layer. Bake for 30–40 minutes until golden brown and filling bubbles at the edges.
  2. Allow to cool completely in the pan on a wire rack before lifting out to slice.
Serving
  1. Cool at room temperature for at least 1 hour, then chill for 30 minutes before slicing. Serve at room temperature or slightly chilled.

Notes

Store cooled bars in an airtight container in the fridge for up to 4–5 days, or freeze for up to 3 months. Thaw overnight in the fridge for best results.