Pecan Butterscotch Bars

Made these amazing treats for Book Club-so delicious, I should have doubled the recipe!!

Ingredients
¾ cup (1 ½ sticks) butter
2 cups dark brown sugar
1 ½ cups flour
1 teaspoon salt
2 teaspoons baking powder
2 eggs
2 teaspoons vanilla extract
1 cup chopped pecans (or walnuts)

Directions
Preheat the oven to 350?F and grease a 9 by 9-inch pan (or double the recipe and use a 9 by 13-inch pan).
In a small saucepan over low heat, melt the butter. Add the brown sugar and stir.
In a medium bowl, mix the flour, salt, and baking powder.
Pour the butter-sugar mixture into the flour mixture and stir until combined. Add the egg and vanilla and stir well. Add ½ cup of the nuts and stir.
Pour the batter into the pan. Sprinkle the remaining nuts on top and pat them into place.
Bake for about 25 to 30 minutes. They may look underdone, but they’ll be chewily delicious when cool.