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Blueberry Oatmeal Crumble Bars

Blueberry Oatmeal Crumble Bars 2025

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Sweet, hearty, and bursting with juicy blueberries, these Blueberry Oatmeal Crumble Bars are the ultimate comfort snack. Whether it’s for breakfast, a midday bite, or dessert, these easy bars deliver chewy oat texture with a sweet crumble that’ll have you saying ‘whoa’ mid-bite.

  • Total Time: 55 minutes
  • Yield: 9 bars 1x

Ingredients

Scale
  • 1 ½ cups rolled oats (not quick or steel-cut)
  • 1 cup all-purpose flour (or 1:1 GF blend)
  • ½ cup light brown sugar
  • ½ teaspoon salt
  • ½ cup unsalted butter, melted (or coconut oil for vegan)
  • 2 cups blueberries (fresh or thawed frozen)
  • 1 teaspoon lemon juice
  • 1 tablespoon cornstarch (optional)
  • 1 teaspoon vanilla extract (optional)
  • ½ teaspoon cinnamon (optional)
  • 1 tablespoon chia seeds (optional)

Instructions

  1. Preheat the oven to 350°F and line an 8×8-inch baking dish with parchment paper, leaving overhang for easy removal.
  2. In a bowl, mix rolled oats, flour, brown sugar, and salt.
  3. Pour in melted butter and stir until the mixture becomes crumbly.
  4. Press two-thirds of the mixture firmly into the bottom of the prepared pan.
  5. In another bowl, toss blueberries with lemon juice and cornstarch. Add vanilla, cinnamon, or chia if using.
  6. Spread the blueberry mixture evenly over the crust.
  7. Crumble the remaining oat mixture over the berries without pressing it down.
  8. Bake for 35–40 minutes, or until the top is golden and the berries are bubbly.
  9. Cool completely, then refrigerate for at least 1 hour before slicing for clean bars.

Notes

Use thawed and lightly drained frozen berries to avoid soggy bars. Store refrigerated for up to a week or freeze individually wrapped for up to 3 months.

  • Author: Sabella Sachi
  • Prep Time: 15 minutes
  • Cook Time: 40 minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 bar
  • Calories: 220
  • Sugar: 10g
  • Sodium: 90mg
  • Fat: 9g
  • Saturated Fat: 5g
  • Unsaturated Fat: 3g
  • Trans Fat: 0g
  • Carbohydrates: 30g
  • Fiber: 2g
  • Protein: 3g
  • Cholesterol: 15mg