Mom's Sugar Cookies -Mom's Cookbook

Ingredients

• 2 1/2 cups sifted flour
• 1/2 tsp soda
• 1/2 tsp salt
• 1 egg slightly beaten
• 2 teaspoon vinegar
• 2 tsp vanilla
• 1 cup unsalted butter
• 1/2 cup shortening
• 1 cup sugar