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oat flour blondies

Oat Flour Blondies

Rarely do you hear a blondie described as chewy and flavorful but these are it: made with oat flour, in ten minutes and in one bowl. 
Prep Time 10 minutes
Cook Time 29 minutes
Servings 16 bars


  • square metal pan 8" or 9"


  • 170g or ¾ cup unsalted butter cold is fine
  • 300g or 1 ½ cups brown sugar dark or light
  • ¾ teaspoon fine sea salt
  • 1 teaspoon pure vanilla extract
  • 1 large egg plus 1 large yolk
  • 190g or 1 ¾ cups oat flour store-bought
  • up to 1 cup dark chocolate chips


  • Preheat the oven to 350 F. Grease an 8 or 9” square pan and line with two parchment slings (one on each side).
  • Set the butter in a large heatproof bowl and melt the butter in the microwave for about 1 minute, it shouldn’t be fully melted.
  • Add the sugar and stir to combine, return to the microwave for another 30 seconds. Whisk the mixture quickly until it gets shiny and cohesive. Add the salt and vanilla and whisk to combine.
  • Add the egg and yolk and whisk for a full minute, the mixture will turn glossy. Sprinkle in the oat flour (or sift it in if it's lumpy) and stir in the chocolate chips and fold with a rubber spatula.
  • Pour batter into the prepared pan and bake for about 30-35 minutes, until the center puffs up a bit and a cake tester comes out with bits but is not gooey. Let cool in the pan and slice once firm.
  • Store in an airtight container. They’ll be nice and chewy for days. If you like you can store these in the fridge, they are chewy and fudge like when cold.



I often like to let my batter sit for at least half an hour at room temp before baking, this helps the oat flour dissolve better.