Go Nuts: Peanut Butter Blondies with Peanut Butter Frosting Recipe

CakeSpy Note: This is a guest post and recipe from Cake Gumshoe Julia, a 26 old wife, exercise fiend, and baking enthusiast. Her writing can be find at her site, Fat Girl Trapped in a Skinny Body.

 Do you love peanut butter?

Did you know I love peanut butter?

I mean LOVE peanut butter. Not in a romantic way, but in a mouth watering, makes my taste buds sing kinda way. As I am getting older, not old, just older, I'm growing out of the idea that a dessert has to be based around chocolate. I now understand that a freaking amazing, mouth watering, makes you jump in the air with excitement, dessert can be based on something other than chocolate: peanut butter.

Saturday morning I woke up super early with lots of excitement and anticipation about what I would bake that day--and I realized it must be Blondies. And I could add peanut butter and make them extra delicious. I felt content with my decision. And after you make these, you will understand why I was so content. I can't say I am in love with these, because I am in love with my husband (ahh, how romantic of me). But I can say, with confidence, that these are one of my all time favorite desserts.

Peanut Butter Blondies

Recipe adapted from My Kitchen Addiction


  • 1/2 cup (1 stick) unsalted butter
  • 2 cups dark brown sugar
  • 1/2 cup peanut butter
  • 2 eggs 
  • 1 teaspoon vanilla extract
  • 2 1/2 cups all purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 cup milk chocolate chips

Peanut Butter Frosting

Recipe adapted from Ina Garten


  • 1 cup peanut butter
  • 1 cup powdered sugar
  • 1/3 cup half and half
  • 1 tsp vanilla extract
  • 2 tbsp butter, softened
  • 1/8 tsp kosher salt


  1. Preheat the oven to 350°F. Grease a 9-inch by 13-inch pan and set aside.
  2. In a saucepan over medium heat, melt the butter and brown sugar, stirring constantly until smooth.
  3. Remove from the heat, and stir in the peanut butter.
  4. Allow to cool while combining the dry ingredients – flour, baking powder, baking soda, and salt – in a large mixing bowl.
  5. Add the eggs, one at a time, to the brown sugar and peanut butter mixture, mixing well after each addition.
  6. Add the vanilla extract and stir to combine.
  7. Pour the mixture into the prepared dry ingredients, and stir to create a thick, smooth batter.
  8. Transfer the batter to the prepared pan, spreading the batter evenly to the edges of the pan.
  9. Sprinkle with the milk chocolate chips, lightly pressing them into the batter.
  10. Bake for 25 minutes. Allow to cool in the pan.
  11. Mix all the frosting ingredients in a bowl with a hand mixer. Beat for about 2-3 minutes; until all the ingredients are incorporated. Spread onto the cooled blondies.
  12. Sprinkle with mini chocolate chips. Cut into 15 large squares, serve and enjoy with a glass of ice cold milk!

These are rich, dense, and simply delicious!