Beat the softened butter at medium speed until light and creamy
Add the sugar and beat until fluffy
Beat in the eggs one at a time, scraping the bowl occasionally
Combine the flour, baking powder, and salt
Beat in the flour mixture alternating with the milk in three batches.
Scrape down the bowl and add the lemon zest and the lemon juice or extract
Pour the batter into the prepared pans and bake at 350 degrees for 35 minutes or until a toothpick inserted comes out clean.
Cool cakes for 10 minutes then turn out on a cooling rack.