Preheat oven to 350°F. Place 18 paper baking cups into muffin pans.
In a bowl using an electric mixer, combine Splenda Sweetener, sugar, and butter. Beat on medium speed for about 2 minutes until light.
In a bowl, combine flour, dry milk powder, baking powder, baking soda, and salt.
In another bowl, combine buttermilk, eggs, and extracts; stir well.
Add about ⅓ of the flour mixture to the butter mixture; blend on low speed to combine well. Add half the buttermilk mixture and mix to combine. Add another ⅓ of flour mixture and blend. Add the remaining buttermilk mixture and blend to combine; then blend in remaining flour mixture. Beat on medium-high speed for about 30 seconds.
Pour batter into prepared baking cups. Bake cupcakes for 12–15 minutes or until a wooden pick inserted in the center comes out clean.