USDA MEDIAN BERRY · 12.7 mm · 1.5 gFREE · NO SIGN-UP
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Baked Goods

Blueberry Oat Crumble Bars

Prep15 min
Cook45 min
Total1 hr + cooling
Yield8×8 pan · 12 bars
DifficultyEasy

Ingredients

  • 1 1/2 cupsall-purpose flour
  • 1 cupold-fashioned rolled oats
  • 3/4 cuplight brown sugar, packed
  • 1/2 tspbaking powder
  • 1/2 tspfine salt
  • 3/4 cupunsalted butter, melted
  • 2 cupsfresh blueberries≈ 198 median blueberries
  • 1/4 cupgranulated sugar
  • 1 tbspcornstarch
  • 1 tbsplemon juice

Steps

  1. Preheat oven to 375°F (190°C). Line an 8×8-inch pan with a parchment sling.
  2. Stir flour, oats, brown sugar, baking powder, and salt. Pour in melted butter and mix until evenly clumpy.
  3. Press two-thirds of the mixture firmly into the pan. Reserve the rest for topping.
  4. Toss blueberries with granulated sugar, cornstarch, and lemon juice; spread over the base.
  5. Crumble the reserved oat mixture over the berries in uneven clumps.
  6. Bake 40–45 minutes, until the top is golden and the filling bubbles at the edges.
  7. Cool completely in the pan — at least 2 hours — before lifting out and cutting. Warm bars fall apart.

Notes

  • One bowl does the base and the topping. Resist adding extra butter; the bars firm up as they cool.
  • Refrigerated bars cut cleaner and keep 5 days.
A 100-gram serving of blueberries contains roughly 160 mg of anthocyaninsLaid end-to-end at 12.7 mm apiece, it would take about 30 billion berries to reach the MoonThe world's largest blueberry weighed 16.2 grams — a Guinness record set in Australia in 2020Wild lowbush blueberries are about 40% smaller than cultivated highbush onesThe United States and Canada together produce roughly half of the world's cultivated blueberriesA 100-gram serving of blueberries contains roughly 160 mg of anthocyaninsLaid end-to-end at 12.7 mm apiece, it would take about 30 billion berries to reach the MoonThe world's largest blueberry weighed 16.2 grams — a Guinness record set in Australia in 2020Wild lowbush blueberries are about 40% smaller than cultivated highbush onesThe United States and Canada together produce roughly half of the world's cultivated blueberries