Preheat oven to 350°F. Place 12 paper liners in a muffin tin.
In a medium bowl, sift together flour, cocoa, baking powder and salt.
In a large bowl or mixer, cream butter and sugar until light and fluffy. Add eggs one at a time, then beat in vanilla.
With the mixer on low speed, alternate adding the flour mixture with the greek yogurt.
Pour batter into muffin tin, filling them about ¾ full. Bake for 20-25 minutes or until a toothpick inserted in the center comes out clean. Cool in pan for 5 minutes and then transfer to a wire rack to cool completely.
Recipe by Life at Cloverhill at https://lifeatcloverhill.com/2013/10/batty-halloween-cupcakes.html