Step 1

Preheat oven to 375° and line 8 x 8 inch baking dish with non-stick foil or foil sprayed with non-stick cooking spray.

Step 2

In a small bowl, whisk together flour, salt, soda, and baking powder and set aside.

Step 3

In a larger bowl, using a hand mixer, beat butter with the 1/4 cup sugar and 1/4 cup brown sugar until very light and fluffy. Add egg yolk, water, vanilla; mix well. Stir in flour mixture.

Step 4

Pat into baking dish and top with chocolate chips.

Step 5

Beat egg white until stiff; gradually beat in ½ cup brown sugar. Spread over chocolate. Bake in for 25 minutes or until top is golden. Cut into bars while warm. Cool completely.