Preheat oven to 350F (180C) and line 9x13 pan with parchment paper.
Sift the flour, baking powder, baking soda, and salt. Set aside and do the same with the sour cream and vanilla extract.
Beat the butter and sugar until light and fluffy, about 4 minutes if using a stand mixer. Or, 2-3 minutes if using an electric mixer.
Add the eggs, one at a time, waiting for each to blend completely before adding the next.
Add the flour mixture in three parts, altering with the sour cream mixture, starting and ending with the flour mixture.
Once you have added the last portion of the flour, turn the mixer off and use a rubber spatula to fully incorporate it.
Spread the batter into the prepared pan and bake over the medium oven rack for 40-42 minutes. Or until the cake top is golden brown and a toothpick comes out with a few moist crumbs from the center of the cake.