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+ servings
Blueberry Bar

The Best Blueberry Oat Streusel Bars

Chef Norbert
Prep Time 1 hr 30 mins
Cook Time 40 mins
Total Time 2 hrs 10 mins
Course Breakfast, Dessert
Cuisine American
Servings 40
Calories 179 kcal


Blueberry filling

  • 24 ounce blueberries frozen
  • 6 ounce granulated sugar
  • 3 tbsp cornstarch
  • 2 ounce cold water


  • 1 pound whole wheat flour
  • 12 ounce old fashioned oatmeal
  • 12 ounce light brown sugar
  • 10 ounce butter unsalted
  • 1 tsp vanilla extract
  • 4 ounce apple sauce, unsweetened
  • 4 ounce extra virgin olive oil


Cook the blueberries

  • Combine frozen blueberries, sugar, cornstarch, and water in a saucepan and bring to a boil. Reduce heat and simmer for about 5 minutes, cook until thick stirring frequently.
    3 tbsp cornstarch, 2 ounce cold water, 6 ounce granulated sugar

Make the dough

  • Place flour, oats, brown sugar into a mixing bowl. Blend until combined. Cut chilled butter into small pieces, add to flour, add vanilla extract and mix until mixture resembles a coarse consistency. Add oil and apple sauce and blend for about 5 minutes to a crumble.
    1 pound whole wheat flour, 12 ounce old fashioned oatmeal, 12 ounce light brown sugar, 10 ounce butter, 1 tsp vanilla extract, 4 ounce apple sauce, unsweetened, 4 ounce extra virgin olive oil

Assemble the oat streusel bars

  • Preheat oven to 350 F. Set aside approximately 1/3 of the flour crumble mixture. Pour the remaining flour crumble mixture into a parchment-lined half sheet pan. Pat flour crumble mixture into an even layer on the bottom of the pan. Spread blueberry mixture on top all the way to the edges. Top blueberry mixture with reserved streusel.

Bake and cut the bars

  • Bake at 350 F in oven for 40 minutes or until streusel is lightly browned and filling is bubbling. Cool and cut into 40 bars.

Chef Notes

There are definitely applications for both fresh and frozen blueberries. The North American blueberry season and harvest run from April to late September. Then, imports from South America fill the grocery store shelves from October to March. You may be surprised, research shows that frozen blueberries might have the edge over fresh berries when it comes to health. They are picked at the peak of the season and are flash-frozen. Frozen blueberries contain the same nutrients as fresh blueberries.


Serving: 1each | Calories: 179kcal | Carbohydrates: 24g | Protein: 2g | Fat: 9g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 1g | Cholesterol: 15mg | Sodium: 4mg | Potassium: 73mg | Fiber: 2g | Sugar: 14g

Nutrition information is calculated using an ingredient database and should be considered an estimate

Keyword Bakery
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