Chocolate Chip Blondies (Congo Bars)

These chocolate chip blondies (aka congo bar) take traditional blondies from good to great! Not only are they delicious, but there is very little oil in these babies. They get a makeover with the addition of Greek yogurt, and they are so moist and chewy. Just as a blondie should be!

chocolate chip blondies (congo bars)

What is a Chocolate Chip Blondie?

A chocolate chip blondie is like a brownie but does not contain cocoa powder. Instead, blondies have brown sugar for that added chew. And in this case, chocolate chips!

Traditional chocolate chip blondies, also known as congo cookies, call for a lot of oil. This is very similar to a traditional brownie recipe. I’ll tell you a secret though.

I use oil sparingly and only when necessary to achieve the right texture and crumb because butter is preferable, but sometimes oil plays a key role in recipe development.

Sometimes I use a little oil, such as in my Naked Carrot Cake Recipe, but you will not find too many desserts or recipes with oil.

I use good quality unsalted butter and vanilla Greek yogurt in this recipe, and boy, do they make these blondies delicious!

Unlike regular brownies that need to be mixed by hand, this chocolate chip blondie recipe is mixed in a stand mixer using the creaming method. The texture is chewy and soft, just like the texture of a brownie.

congo bars (chocolate chip blondies)

How do You Make Chocolate Chip Blondies?

  1. Cream the butter, yogurt, and sugar. Add eggs, oil, and vanilla and mix.
  2. Add all dry ingredients, including the chocolate chips.
  3. Spread into a greased and floured 9×9 pan.
  4. Bake for 25 minutes. Let cool and enjoy!
  5. Sounds easy, right? Well it is!
chocolate chip blondie recipe

What do I Need to Make These Delicious Blondies?

chocolate chip blondies congo bars recipe

Chocolate Chip Blondies

chocolate chip blondies (congo bars) up close to show melty chocolate chips

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  • Author: Camille
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 35 minutes
  • Yield: 16 bars 1x
  • Category: bars


Units Scale

For the Chocolate Chip Blondies (Congo Bars)

  • 113 g (1/2 c) unsalted butter, room temperature
  • 2 1/2 Tbs vanilla Greek yogurt
  • 1 Tbs canola oil
  • 350 g (1 3/4 c) light brown sugar
  • 2 large eggs, room temp
  • 1 tsp vanilla
  • 210 g (1 3/4 c) all-purpose flour
  • 3/4 tsp salt
  • 3/4 tsp baking powder
  • 1 cup semi-sweet chocolate chips


To Make Chocolate Chip Blondies

  1. Preheat oven to 350 F. Butter and flour a 9×9 inch pan, or spray and line with parchment.
  2. Cream butter, brown sugar, and Greek yogurt in a stand mixer fitted with a paddle attachment. 
  3. Add eggs, oil, and vanilla, and mix; the batter will be thin and runny.
  4. Add the flour, salt, baking powder, and chocolate chips. Mix on low speed until the ingredients come together. Do not continue to mix. The blondie batter will be very sticky.
  5. Pour batter into pan and spread into corners and sides with a spatula until the batter fills most of the space in the pan. 
  6. Bake for 20-25 minutes, or until golden brown around the edges. The middle will be lighter in color. For a fudgier blondie, bake close to 20 minutes so that it’s not quite as set. 
  7. Let cool entirely before cutting. Cut into 12 – 16 bars and store in an airtight container…if they last long enough to need storing!


This is a Baker Street Society original recipe.

chocolate chip blondies on brown parchment paper with a baking pan underneath
stack of chocolate chip blondies on a baking tray with parchment paper


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