Instructions:
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Preheat oven:
Set oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper and lightly grease it. -
Make the blueberry filling:
In a saucepan over medium heat, combine blueberries, lemon juice, sugar, and cornstarch. Stir until thickened and jam-like (about 5–7 minutes). Remove from heat and let cool slightly. -
Prepare the oat mixture:
In a large bowl, mix oats, flour, brown sugar, baking soda, and salt. Stir in melted butter and vanilla until the mixture becomes crumbly. -
Assemble:
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Press about two-thirds of the oat mixture firmly into the bottom of the prepared pan.
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Spread the blueberry filling evenly over the crust.
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Sprinkle the remaining oat mixture on top and gently press down.
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Bake:
Bake for 25–30 minutes, or until the top is golden brown and crisp. -
Cool and cut:
Let cool completely before cutting into bars for clean slices.
Storage:
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Store in an airtight container at room temperature for up to 3 days, or refrigerate for up to 1 week.
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These also freeze well — just wrap individually and store up to 2 months.
Tips:
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Add a pinch of cinnamon or nutmeg for a warm flavor.
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Swap blueberries for mixed berries or chopped apples.
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For extra richness, drizzle with a light vanilla glaze after baking.
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