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close up of oatmeal chocolate chunk bars sliced into bars

Oatmeal Chocolate Chip Bars

These tasty oatmeal chocolate chip bars are super easy and quick to make! Step-by step photos teach you how to bake these cookie bars! 

  • Total Time: 35 minutes
  • Yield: 9-16 Bars 1x


Units Scale
  • 6oz (3/4 Cup) Unsalted Butter, melted and slightly cooled
  • 100 grams (1/2 Cup) Granulated/ Caster Sugar
  • 150 grams (3/4 Cup) Light Brown Sugar
  • 1 Large Egg + 1 Large Egg Yolk, at room temperature
  • 2 Teaspoons Pure Vanilla Extract
  • 166 grams (1 1/3 Cups) All-Purpose/ Plain Flour
  • 100 grams (1 Cup) Old Fashioned Rolled Oats
  • 1/4 Teaspoon Salt
  • 1/2 Teaspoon Baking Powder
  • 1 Teaspoon Cornstarch/ Cornflour
  • 270 grams (1 1/2 Cups) Chocolate Chips or Chunks


  1. Preheat the oven to 350F/180C and line with parchment paper or foil and lightly grease a 9-inch square baking pan.
  2. In a medium-sized bowl whisk together the flour, baking powder, salt, and cornstarch. Set aside.
  3. In a large bowl whisk together the butter and sugars. Make sure to scrape down the sides of the bowl to ensure all is combined.
  4. Stir in vanilla, egg, and egg yolk, making sure to mix until fully combined. Scrape down the sides of the bowl again.
  5. Gently fold in dry ingredients and chocolate chunks until just combined. I like to save a few of the chocolate pieces to place on top of the bars before baking, just for aesthetics.
  6. Pour cookie dough into the prepared pan and gently press into an even layer, top with additional chocolate chips if desired. Bake the cookie bars for 23-26 minutes*. The edges should be golden brown and pulling from the edge of the pan, the center will still giggle a bit.
  7. Let the bars cool in the pan on a wire rack for 25 minutes then slice and serve. Store leftovers in an air-tight container for up to 5 days.
  • Author: Elizabeth Waterson I Confessions of a Baking Queen
  • Prep Time: 10
  • Cook Time: 25
  • Category: Dessert
  • Method: Bake
  • Cuisine: American

Keywords: oatmeal chocolate chip cookie bars, chocolate chip oat cookie bars

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