2/3 c. melted butter
1 lb. light brown sugar
3 eggs
3 c. flour
1 1/2 tsp. baking soda
1/2 tsp. salt
1 (6 oz.) pkg. semi-sweet chocolate chips
1 tsp. vanilla
1 c. chopped nuts (optional)

Cream together butter and sugar. Add eggs and flour mixture (flour, soda and salt) alternating egg and 1 cup flour. Add vanilla. Stir in chips and nuts. Bake in greased and floured 9x13 inch pan for 30-40 minutes at 350 degrees. Cool. Cut into squares.