Snickerdoodle Blondies

I have made this recipe twice but it has disappeared both times before I could get a picture of it. I guess it's a winner! I'm sure Sabrina will love these--an easy Snickerdoodle! 

Oven 350° 
Makes 24 large blondies

4 cups flour
3 teaspoons baking powder
1½ teaspoons salt
1½ teaspoons cinnamon
⅓ teaspoon nutmeg
3 cups brown sugar
1½ cups butter, softened
3 eggs
1½ tablespoons vanilla
3 tablespoons sugar
3 teaspoons cinnamon

Preheat oven to 350°. Whisk together the flour, baking powder, salt, cinnamon and nutmeg in a medium bowl. Set aside. Beat together the butter and brown sugar on medium speed until light and fluffy, about 5 minutes. Add the eggs one at a time, and then the vanilla. Beat, scraping the bowl, until thoroughly combined. On low speed, gradually add the flour mixture until just combined. Spread the dough evenly onto a greased 11 x 17 baking sheet. Combine the 3 tablespoons of sugar and 3 teaspoons of cinnamon and sprinkle evenly over the surface of the batter. Bake for 25 to 30 minutes at 350° or until the surface springs back when gently pressed. Cool completely before cutting.