In a small bowl, whisk together the flour, baking powder, soda and salt. In the bowl of your electric mixer, beat the butter on medium speed until creamy, then add the sugar and beat for 4 to 5 minutes on medium speed until fluffy, scraping down the sides if needed. Add the eggs one at a time, beating well for a minute or so after each addition. Add the vanilla and beat well. Beat in the yogurt, again scraping down the sides if needed.