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Close up of the dense baked oat and butter base topped with vibrant red cooked fresh strawberries.

The Ultimate Jammy Strawberry Oatmeal Bars

Master the art of baking with these visually stunning Strawberry Oatmeal Bars. Featuring a dense buttery oat crust, a thick jammy fresh strawberry filling, and a golden-brown toasted crumble topping.
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings: 16 squares
Course: Breakfast, Dessert
Cuisine: American
Calories: 210
Ingredients Equipment Method Notes

Ingredients
  

Crust and Crumble Topping
  • 1 1/2 cups rolled oats 150g, old-fashioned
  • 1 1/2 cups all-purpose flour 180g
  • 3/4 cup light brown sugar 150g, packed
  • 1/2 tsp baking powder 3g
  • 1/2 tsp fine sea salt 3g
  • 3/4 cup unsalted butter 170g, melted
Strawberry Jam Filling
  • 3 cups fresh strawberries 450g, hulled and diced
  • 1/3 cup granulated sugar 65g
  • 1 tbsp cornstarch 8g
  • 1 tbsp fresh lemon juice 15ml

Equipment

  • 1 8x8 inch baking pan Metal preferred for even baking.
  • 1 Parchment Paper Leave an overhang for easy removal.

Method
 

Preparation and Base
  1. Preheat the oven to 350°F (175°C). Line an 8x8-inch (20x20cm) baking pan with parchment paper, leaving an overhang.
  2. In a large bowl, whisk together the rolled oats, all-purpose flour, brown sugar, baking powder, and fine sea salt.
  3. Pour the melted butter into the dry mixture. Stir well until the mixture resembles coarse, wet sand.
  4. Transfer two-thirds of the oat mixture into the prepared pan. Press it down very firmly in an even layer to create the dense base.
Filling and Baking
  1. In a medium bowl, combine the diced strawberries, granulated sugar, cornstarch, and lemon juice. Toss until no dry cornstarch remains.
  2. Pour the strawberry mixture evenly over the packed oat crust.
  3. Sprinkle the remaining one-third of the oat mixture over the fruit layer, squeezing it slightly to form larger crumble pieces. Ensure some strawberries remain visible.
  4. Bake for 35-40 minutes until the top is golden-brown and the fruit filling is audibly bubbling around the edges. Cool completely before slicing.

Notes

Tip 1: Always press the bottom crust firmly with a flat glass to prevent the bars from crumbling.
Tip 2: Allow the bars to cool for at least 2 hours before cutting so the jammy center can fully set.