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Strawberry Oatmeal Crumble Bars

Strawberry oatmeal crumble bars with a golden oat crumble topping and bright red strawberry filling. Sliced strawberries thicken with lemon and cornstarch, then bake until the top is golden brown and the bars hold together.
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Prep Time 15 minutes
Cook Time 35 minutes
Cooling 15 minutes
Total Time 1 hour 5 minutes
Servings: 12 servings
Course: Dessert
Cuisine: American
Calories: 310
Ingredients Equipment Method Notes

Ingredients
  

Oat base and crumble
  • 2 cup old-fashioned oats
  • 1.5 cup all-purpose flour
  • 0.5 cup granulated sugar
  • 0.5 cup brown sugar
  • 1 tsp baking powder
  • 0.5 tsp salt
  • 0.75 cup unsalted butter softer for easier cutting in
Strawberry filling
  • 1.5 cup fresh strawberries sliced
  • 0.25 cup granulated sugar
  • 1 tbsp lemon juice
  • 1 tbsp cornstarch
Serving
  • powdered sugar for dusting

Equipment

  • 1 sheet pan

Method
 

Bake setup
  1. Preheat the oven to 350°F and line a 9x13 baking dish with parchment paper.
  2. Combine old-fashioned oats, all-purpose flour, granulated sugar, brown sugar, baking powder, and salt in a large bowl.
Make the crumble and layer
  1. Cut in softened unsalted butter until the mixture resembles coarse crumbs.
  2. Press half of the oatmeal mixture firmly into the prepared baking dish.
  3. Combine sliced fresh strawberries, granulated sugar, lemon juice, and cornstarch in a bowl.
  4. Spread the strawberry filling evenly over the base layer.
  5. Spread the remaining oatmeal mixture over the strawberries and press gently.
Bake and finish
  1. Bake for 30-35 minutes at 350°F until the top is golden brown, with visible crumble edges.
  2. Allow the bars to cool for 15 minutes before cutting into bars for clean slices.
  3. Dust with powdered sugar before serving.

Notes

For neat, sliceable bars, cool fully enough to firm up—then lift using the parchment and cut with a sharp knife. Store airtight in the refrigerator up to 4 days; freeze bars up to 2 months. For a dairy-light option, use a plant-based unsalted butter stick in the crumble (look for one that creams like butter).