Set oven rack in the lower third of the oven.
Preheat to 350 degrees.
Butter the bottom and sides of your baking pan
Whisk; flour, baking powder, baking soda, and salt in a medium bowl.
Set bowl aside.
Beat granulated sugar and soft butter at medium speed until very light in color and also fluffy.
Scrape down the sides of the bowl as needed.
With the mixer still on medium slowly add eggs and continue to beat into mixture until fully integrated
Reduce the speed of the mixer to it’s lowest setting.
Now while the mixer continues to run, add 1/3 of the flour mixture.
Now add 1/2 of the buttermilk mixture.
After adding the buttermilk mixture, add 1/2 of the remaining flour mixture.
Next alternate by adding the rest of the buttermilk mixture and lastly the rest of the flour mixture.
Scrape the sides and beat until well mixed.