Description
Rustic and comforting, these Blueberry Oatmeal Crumble Bars feature a buttery oat crust, juicy blueberry filling with bright lemon notes, and a golden, crumbly topping. Perfect for breakfast, snacks, or dessert, they’re easy to make, great for make‑ahead, and wonderfully adaptable.
Ingredients
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Crust & crumble:
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1 cup all-purpose flour
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¾ cup old-fashioned rolled oats
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½ cup granulated sugar
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¼ cup dark brown sugar
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½ tsp baking powder
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¼ tsp salt
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½ tsp ground cinnamon (optional)
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½ cup unsalted butter, melted
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1 egg yolk
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Blueberry filling:
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2 cups fresh or frozen blueberries
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2 Tbsp fresh lemon juice
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Zest of ½ lemon (optional)
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¼ cup granulated sugar
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2 tsp cornstarch
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Optional add‑ins:
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½ tsp vanilla extract in crumble
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Chopped nuts (walnuts/almonds)
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Instructions
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Preheat & line pan: Preheat oven to 350 °F (175 °C). Line an 8×8″ pan with parchment.
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Mix crust/crumble: In a bowl, combine flour, oats, sugars, baking powder, salt, (cinnamon), then stir in butter and egg yolk until crumbly. Reserve 1 cup for topping; press the rest into the pan.
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Prepare filling: Toss blueberries with lemon juice, zest, sugar, and cornstarch. Spread evenly over crust.
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Add crumble topping: Sprinkle reserved crumble evenly over berries.
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Bake: Bake for 35–40 min until top is golden and filling is bubbling.
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Cool thoroughly: Let cool fully (2+ hours) before cutting into bars. Chill for best texture.
Notes
Use cold butter and handle crumble quickly to keep texture light.
Lemon juice brightens the filling—don’t skip it.
Full cool-down ensures clean slices.
Make gluten-free with GF flour and oats; vegan with plant-based butter and flax egg.
Try swapping in raspberries, blackberries, or adding nuts.
- Prep Time: 20 minutes
- Cook Time: 40 minutes
- Category: Breakfast / Snack / Dessert
- Method: Baking
- Cuisine: American
Keywords: blueberry crumble bars, oatmeal bars, breakfast bars, fruit crumble, make-ahead snack, blueberry dessert