Cookie Butter Cupcakes - Cupcake Fanatic

Ingredients

• 1 3/4 cups cake flour
• 6 butter almond thins (approx 1 ounce), pulsed
• 1/2 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1/4 cup unsalted butter, softened
• 1 cup sugar
• 2 large egg yolks, at room temperature
• 1 tsp vanilla extract
• 1/4 cup plain fat-free yogurt
• 1 cup low-fat buttermilk
• 3 large egg whites, at room temperature
• 1/4 tsp cream of tartar
• 1/4 cup cookie butter