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5 from 1 vote

Blueberry Crumble Bars

A buttery, oatmeal base and crumb topping with a homemade blueberry filling in the middle. A delicious dessert that feeds a crowd!
Prep Time15 mins
Cook Time35 mins
Resting time2 hrs
Total Time50 mins
Course: Dessert
Cuisine: American
Keyword: easy blueberry crumble bars
Servings: 24
Calories: 294kcal
Author: Natalie Dixon


Oatmeal Crumb Layer

  • 1.5 cups Butter
  • 3 cups Rolled Oats
  • 3 cups All-purpose Flour
  • 2 cups Light Brown Sugar
  • 1 tsp Baking Powder
  • 1/2 tsp Salt

Blueberry Filling

  • 2 cups Blueberries
  • 1/2 cup Sugar
  • 2 Tbsp. Cornstarch
  • 2 Tbsp. Lemon Juice


Oatmeal Crumb Layer

  • Preheat oven to 350 degrees.
  • In a large bowl, melt butter. Add remaining crumb ingredients to melted butter. Stir well until completely combined.
  • Press about 2/3 crumb mixture into the bottom of a 13x9 pan. Press down well. Bake for 10 minutes.

Blueberry Filling

  • In a medium saucepan, add all ingredients for the blueberry filling. Bring to a boil while stirring constantly. Continue stirring until the mixture has thickened, about 2-3 minutes.
  • Spread filling over baked crust. Sprinkle reserved crumbs over filling.
  • Bake for about 25 minutes until the crust just begins to turn a light, golden brown. Remove from oven and cool.


I usually place the cooled bars in the fridge for a couple hours to help them set faster.
Rolled oats work best for this recipe, but I've also used instant oats if that's all I have on-hand.
These can be stored at room temperature or in the fridge. I prefer to eat them chilled from the fridge!


Calories: 294kcal | Carbohydrates: 44g | Protein: 3g | Fat: 12g | Saturated Fat: 7g | Cholesterol: 30mg | Sodium: 156mg | Potassium: 111mg | Fiber: 1g | Sugar: 23g | Vitamin A: 360IU | Vitamin C: 1.7mg | Calcium: 36mg | Iron: 1.3mg