Mud Hen Bars

Ingredients:
1/2 cup butter (room temperature)
1 cup granulated sugar
3 large eggs, separated (1 whole egg plus 2 yokes, 2 egg whites)
1 1/2 cups AP flour
1 teaspoon baking powder
1/4 teaspoon salt
1/2 cup semi-sweet chocolate chips
1 cup chopped nuts (I mixed pecans and walnuts)
1 cup mini-marshmallows
1 cup brown sugar (make sure it's soft and clump free!)

1.  Preheat oven to 350 degrees.
2.  In a medium bowl, cream together butter and granulated sugar.  Beat in 1 whole egg and 2 egg yokes (saving the 2 whites for later).
3.  In a separate bowl, mix together the flour, baking powder, and salt.  Add to butter mixture and combine.  Spread into greased 9x13 pan.
4.  Sprinkle evenly with chocolate chips, nuts, and marshmallows.
5.  In a medium bowl (wipe clean your flour mixture bowl and reuse that!) beat remaining 2 egg whites until stiff peaks form.  Gently fold in brown sugar.  Spread over mixture in pan.
6.  Bake for about 25-30 minutes or until bars are a deep golden brown and the crust is cooked through.  Cool on wire rack before cutting.

Source:  Sunday Baker