Maple Walnut Blondies (Applebee's Knockoff)

This is Joe's absolute favorite dessert when eating out.  So I made it for his birthday dessert.  As he was eating it, he said, "I'm glad you know how to make this.  We may be having this a lot more."  It was DELICIOUS! Enjoy!

Maple Walnut Blondie
Recipe from: The Girl Who Ate Everything

1 

cup flour

1/2 

teaspoon baking powder

1/8 

teaspoon baking soda

1/8 

teaspoon salt

1/4 

cup chopped walnuts

1/3 

cup butter, melted

1 

cup packed brown sugar

1 

large egg

1 

tablespoon vanilla extract

1/2 

cup white chocolate chips

Sauce:

1/4 

cup butter, softened

1/4 

cup powdered sugar

1 

ounce cream cheese (2 tablespoons), softened

1 

tablespoon maple syrup

Preheat oven to 350 degrees. Line an 8x8 pan with aluminum foil and spray with cooking spray.
In a bowl add flour, baking powder, baking soda, salt, and walnuts. Whisk to combine. Set aside.
In a large bowl, mix the melted butter and brown sugar with a mixer. Add the egg and vanilla and mix well. Add the flour mixture a little at a time until combined. Stir in white chocolate chips. Spread into the 8x8 pan and bake for 20-25 minutes or until center passes the toothpick test. I like mine a little on the gooey side. Remember right out of the oven they may seem gooey but once they cool they set up more.
Serve warm with ice cream and Maple Butter Sauce.
For the Maple Butter Sauce: In a small bowl add the butter, powdered sugar, cream cheese, and maple syrup. Blend with a mixer until smooth.
When ready to serve, heat the maple butter sauce for about 30 seconds in the microwave and pour over warmed blondie and ice cream.