These Cake Batter Blondie Bars are from Dessert Mash-Ups by Dorothy Kern. Use Halloween sprinkles instead of rainbow sprinkles for some halloween cheer.
Ingredients
Blondie Bars
1 tsp baking powder
½ tsp salt
2 cups all purpose flour
½ cup granulated sugar
1 cup packed brown sugar
½ cup (1 stick) unsalted butter, softened
2 large eggs
1 tsp vanilla extract
1 tsp butter extract
½ cup sprinkles
Frosting
½ cup (1 stick) unsalted butter, softened
1½ cups powdered (icing) sugar
1 tsp vanilla extract
1 tsp milk
sprinkles, for garnish
Instructions
Make the Blondie Bars
Preheat oven to 350F. Spray a 9 x 13 inch pan with cooking spray or line with foil and spray with cooking spray for easy cleanup. (I didn't use foil and it was fine)
In a medium bowl, whisk together the baking powder, salt and flour. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the granulated sugar, brown sugar, and butter. Add the eggs, vanilla, and butter extract, and beat until combined. Add the dry ingredients and mix until combined. Stir in the sprinkles.
Press the dough into the prepared pan. (The dough will be sticky; spray your hands with cooking spray to keep it from sticking to you.) Bake for 22 to 24 minutes. It will be slightly golden, but still have the slightest jiggle in the centre. It will set as it cools. Cool completely before frosting.
Frosting
Using an electric hand mixer or a stand mixer fitted with the paddle attachment, beat the butter until smooth. Slowly add in the powdered (icing) sugar, and mix until crumbly. Add the vanilla, and milk and mix until smooth and fluffy. (My note: When you taste the icing it shouldn't be overly sugary and grate on your teeth - it should be light and fluffy - but it will still be sweet.) Frost the bars. Top with sprinklers and cut into bars.
Store covered at room temperature or in the refrigerator. Best eaten at room temperature within 5 days.
Recipe by Roasted at http://www.roastedmontreal.com/2014/10/halloween-idea-cake-batter-blondie-bars.html