Name: Blueberry Oatmeal Bars
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Yield: 16 bars
Cuisine: American

Knead Some Sweets Verified

January 27, 2026

These easy Blueberry Oatmeal Bars feature a juicy blueberry filling with a buttery brown sugar crust and crumble topping.

From the Cook

1/10

Blueberry Oatmeal Bars

Knead Some Sweets Verified

Ingredients

WarningMilk and 4 other allergens identified

Instructions

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Instructions

Preheat the oven to 350℉. Line a 9X9-inch pan with parchment paper, leaving parchment paper to hang over the sides of the pan.

Whisk together the oats, flour, brown sugar, and baking powder in a large bowl. Mix in the melted butter to create a crumbly texture. Press ⅔ of this mixture into the prepared pan and set aside the rest for later.

In another bowl, stir together the blueberries, sugar, cornstarch, lemon zest, and lemon juice. Smooth the filling over top of the crust and crumble the reserved crust mixture over top.

Bake in the preheated oven for 35-40 minutes or until the topping is golden brown. Serve warm with ice cream or let cool fully before slicing into bars to serve. Enjoy!

Smart Nutrition

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Tips & Tricks (5)

Blueberry Maceration Magic 💙
Toss blueberries with lemon juice and cornstarch 15 minutes before assembling to prevent excess liquid and create a perfectly thickened filling.
Butter Temperature Technique 🧈
Use cold, cubed butter and work it into the dry ingredients with your fingertips to create a perfectly crumbly, flaky crust and topping.
Zest Boost Flavor Hack 🍋
Incorporate lemon zest into both the crust and filling to add a bright, complex citrus note that elevates the entire dessert.
Perfect Layering Pro Tip 📐
Press two-thirds of the oat mixture firmly into the pan as the base, ensuring a compact bottom layer that holds the blueberry filling beautifully.
Cooling Compression Trick 🧊
Allow bars to cool completely in the pan for at least 2 hours to set properly, which helps achieve clean, picture-perfect slices.