frosted butterscotch blondies stacked on each other

Frosted Butterscotch Blondie

Delicious and chewy blondie with caramel butterscotch flavors and a incredible brown sugar frosting. 
Course Dessert
Cuisine American
Keyword blondie, butterscotch
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 32 servings
Calories 177kcal


  • 1/2 cup butter, melted
  • 2 cups brown sugar
  • 2 large eggs
  • 1 teaspoon vanilla
  • 1 1/2 cups flour
  • 2 teaspoons baking powder
  • 1/2 teaspoon salt
  • 1 cup chopped walnuts


  • 1/4 cup butter
  • 1/2 cup brown sugar
  • 1/4 cup milk
  • 2 cups powdered sugar


  • Preheat oven to 350 degrees. Coat a 9 x 13 inch pan with cooking spray and line with parchment, set aside. 
  • In a large bowl, stir together the melted butter and sugar until well combined. Add eggs and vanilla and stir. Stir in the flour, baking powder, and salt until well combined. Fold in the walnuts. Pour into prepared pan using spatula or damp hands to spread evenly. 
  • Bake for 30-35 minutes until sides show signs of pulling away from pan. If blondies start to get too dark while baking, lightly cover with foil. Cool on a wire rack. 
  • While blondies cool, make the frosting. Combine the butter, brown sugar, and milk in a saucepan. Bring to a boil and simmer for two minutes. Remove from heat and cool. Add powdered sugar and stir well. If needed add more milk to make a smooth, spreadable frosting. Spread over cooled blondies. 
  • Cool completely and cut into about squares.


The blondies can be made ahead with excellent results. Once cooled completely, cut and store in an airtight container in the refrigerator for up to a week. Alternatively, you can freeze these for up to two months.