Description
These Blueberry Oatmeal Crumble Bars are a delicious, easy-to-make treat with a buttery oat base, a sweet-tart blueberry filling, and a golden crumble topping. Perfect as a breakfast bar, snack, or fruity dessert, they’re a family favorite with simple ingredients and big flavor.
Ingredients
For the Base & Crumble Topping:
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1 cup all-purpose flour*
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3/4 cup old-fashioned oats (not quick or instant oats)
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1/2 cup granulated sugar
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1/4 cup packed brown sugar
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1/2 tsp ground cinnamon
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1/4 tsp salt
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1/2 cup unsalted butter, melted
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1 large egg yolk (discard the white)
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1 tbsp packed brown sugar (for sprinkling on top)
For the Blueberry Layer:
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2 cups blueberries (fresh or frozen*)
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1 tbsp lemon juice, freshly squeezed
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1/4 cup granulated sugar
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2 tsp cornstarch
Instructions
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Preheat oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper, leaving some overhang for easy removal.
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In a large bowl, combine flour, oats, granulated sugar, brown sugar, cinnamon, and salt. Stir in the melted butter and egg yolk until mixture forms a crumbly dough.
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Press about 2/3 of the mixture into the bottom of the prepared pan to form the crust.
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In a separate bowl, combine blueberries, lemon juice, sugar, and cornstarch. Toss until evenly coated.
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Spread the blueberry mixture evenly over the crust.
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Crumble the remaining dough over the top. Sprinkle with 1 tablespoon brown sugar.
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Bake for 35–40 minutes (add 5–10 minutes if using frozen berries), or until the top is golden and the filling is bubbling.
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Cool completely in the pan, then lift out and cut into bars.
Notes
Use frozen blueberries directly from the freezer. No need to thaw, but increase bake time slightly.
You can substitute part of the all-purpose flour with whole wheat flour for a nuttier flavor.
Store in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days.
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Category: Dessert, Snack
- Method: Baking
- Cuisine: American
Keywords: blueberry bars, oatmeal crumble, fruit dessert, blueberry snack bars, berry crumble bars