Cream Together Wet Ingredients: In a bowl, cream together 1 ½ cups granulated sugar, butter, and peanut butter. Add eggs and vanilla extract, mixing well.
Combine Dry Ingredients: In a separate bowl, combine flour, cream of tartar, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, stirring until fully combined.
Prepare Cinnamon Sugar Mixture: In a small bowl, mix together 3 tablespoons granulated sugar and ground cinnamon.
Shape and Coat the Dough: Scoop out the dough and roll each ball in the cinnamon sugar mixture. Flatten the cookies and place them on a baking sheet.
Bake: Bake at 375°F for 7-8 minutes until the edges are golden brown. Remove from the oven and let them cool on a rack.