Heat oven to 350, and lightly grease a 9x13 inch pan.

Mix the butter and sugars in a large bowl. Add the eggs and vanilla, mix well.

Stir in the flour, baking soda and salt, stir until completely blended.

Fold in the chocolate chips.

Spread into the pan, and bake for 25-27 minutes, or until light golden brown on top. Cool and cut into squares.