Ingredients

• 1/2 cup butter
• 1/2 cup shortening
• 2 cups white sugar
• 4 egg yolks
• 1 teaspoon vanilla extract
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• 1/4 teaspoon salt

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Instructions

1. Preheat oven to 300 degrees F (150 degrees C).
2. In a medium bowl, cream together the butter, shortening, and sugar. Beat in the egg yolks one at a time, then stir in the vanilla. Combine the flour, baking soda, and salt; stir into the creamed mixture. Roll dough into walnut size-balls and place 2 inches apart onto an unprepared cookie sheet.
3. Bake for 20 minutes in the preheated oven. Cool on wire racks.