Ingredients

• 1 pound (4 sticks) butter, room temperature
• 1 cup brown sugar
• 1 cup white sugar
• 2 eggs
• 2 teaspoons vanilla extract
• 5 cups all-purpose flour
• 1 teaspoon cream of tartar
• 1 teaspoon baking soda
• 1 teaspoon salt
• 1 cup chopped pecans or walnuts

Instructions

1. Preheat oven to 350 degrees F.
2. With an electric mixer or by hand, cream butter and sugars in a large bowl. Add eggs and vanilla. In a separate large bowl, sift together the flour, cream of tartar, baking soda and salt. Add flour mixture to egg mixture in 3 additions. Stir in nuts.
3. Divide the dough into quarters, and then roll it into 4 logs. Place dough in refrigerator to chill for 2 hours. Remove dough and cut into 1/4-inch thick slices. Place on a floured, but not greased, baking sheet and bake for about 15 minutes. Remove to a rack and cool.