while you make the batter.
in a separate bowl, whisk to combine, the flour, baking powder, baking soda, and salt.
in the bowl of your electric mixer, or with a hand mixer, beat the butter until smooth and creamy. gradually add the sugar and continue beating until the mixture is fluffy (this will take about 3-5 minutes).
add the eggs, one at a time, mixing well after each addition. make sure to smell the eggs and to check that they are not spoiled before adding them to the mixture or you will need to redo everything, and get and measure out a new set of ingredients. scrape down the sides of the bowl 