1 c. butter
1 c. sugar
1 c. brown sugar
3 1/2 c. flour
1 sm. (6 oz.) pkg. mint chips
1 c. walnuts
2 tsp. vanilla
2 eggs

Cream butter and sugars. Add flour, chips, and walnuts. Mix well. Add 2 teaspoons vanilla and eggs. Press mixture with hands into 15x10 inch pan. Bake at 350 degrees for 20 minutes. Cut while still warm.