Preheat oven to 350°

Beat butter and sugar until creamy.

Add in egg and vanilla extract

Gradually mix in flour and then add 1 cup of chocolate chips.

Press onto bottom of increased 13 x 9 inch baking pan.

Bake for 30-35 minutes until top is a light brown.

After out of the oven, sprinkle the remaining chocolate chips.

Let stand for five minutes before cooling on wire rack.

Cut into squares