Copycat Applebee's Walnut Blondie

I got this recipe on the blog Bakerella, and she got it from the Recipe Secrets website. I decided to make it tonight-it is so good!
Dough
1/2 teaspoon baking powder
1/8 teaspoon baking soda
1/8 teaspoon salt
1 cup flour, sifted
1/4 cup chopped walnuts (or more if desired)
1/3 cup butter or margarine (melted)
1 cup packed brown sugar
1 egg, beaten
1 tablespoon vanilla extract
1/2 cup white chocolate chips

Maple Butter Sauce
3/4 cup maple syrup ( I highly recommend using REAL maple syrup )
1/2 cup butter
3/4 cup brown sugar
1/4 cup chopped walnuts (optional)

Directions:

Dough
Preheat the oven to 350 degrees F.

Add baking powder, baking soda and salt to the already sifted flour. Then sift dry ingredients again.
Add chopped nuts and mix well. Set aside.

Add brown sugar to melted butter and mix well. Then add egg and vanilla extract. Mix well.
Add flour mixture, a little at a time, until mixed well.
Stir in white chocolate chips. Spread out dough in a 9-inch pan.
Bake for 20 to 25 minutes. Use a toothpick or fork to test if it is cooked in the center.
Serve warm with ice cream and Maple Butter Sauce.

Maple Butter Sauce

In a pan, add real maple syrup and butter, cook over low heat until butter is melted. Next, stir in brown sugar until completely dissolved. If you desire, add walnuts.

Enjoy !