preheat oven to 350°

spray pan with vegetable spray

in a large bowl, beat butter with sugars until light and fluffy.

add egg and vanilla; mix well

stir in flour, baking soda and salt; mix well.

stir in chocolate chips.

spread dough into prepared pan.

bake 15-20 minutes or until light golden brown.

cool on rack 5 minutes.

cool completely before cutting or decorating.