Preheat the oven to 425 degrees F. In medium bowl, combine flour, sugar, baking powder, soda and salt (if your baking powder is lumpy, push it through a small sieve). Set aside. In small bowl combine milk, yogurt, egg and butter. Whisk until thoroughly mixed. Fold the egg mixture into the flour mixture until just blended. Gently stir in the cookie pieces Spoon batter into 6-8 (depending on size you want) paper lined or greased muffin tins. Bake in a preheated oven for 10 minutes at 425 degrees F. Decrease temperature to 375 degrees F and bake for 10 more minutes or until a toothpick inserted in center comes out clean. Remove from pan and cool on a wire rack.