Chocolate Chip Cookie Bars

1 cup butter or margarine, softened
3/4 cup sugar
3/4 cup packed light brown sugar
1 teaspoon vanilla extract
2 eggs
1 1/4 cups all-purpose flour
1 cup whole wheat flour
1 teaspoon baking soda
1/2 teaspoon salt
2 cups (12-ounce package) Chocolate Chips
1 cup chopped nuts (optional)

Heat oven to 375 degrees F. In large mixer bowl cream butter, sugar, brown sugar and vanilla until light and fluffy. Add eggs; beat well. Combine flour, baking soda and salt; gradually add to creamed mixture. Stir in chocolate chips and nuts, if desired. Spread batter in greased jelly-roll pan, 15.5x10.5x1-inch. Bake at 375 degrees F. for 20 minutes. Cool completely. Cut into bars. About 4 dozen bars.