In a large bowl, mix sugar and butter until smooth.
Add eggs and vanilla, then beat until well combined.
Mix on high for about 5 minutes to help build structure.
Reduce speed to low and add flour and baking powder alternately with the milk.
Beat well after each addition until the batter is smooth.
Divide batter evenly into greased loaf pans.
Bake for 60 to 70 minutes, or until a toothpick or cake tester comes out clean.
Let cakes cool in the pans for 15 minutes, then remove and place on a cooling rack.
Notes
This cake is pretty forgiving, but a few small things really do make a difference.Let your butter soften at room temperature instead of microwaving it. It mixes better and gives the cake a smoother texture.Bring your eggs to room temperature before adding them so everything combines more evenly.Sifting the flour helps keep the batter lighter instead of dense. It only takes a minute and is worth it.Mix the batter for the full time, even if it already looks good. That extra mixing helps create a better crumb.Bake until a toothpick or cake tester comes out clean. I use these cake testers because they’re perfect for the job and don’t leave a mess.If you want clean slices, let the cake cool completely before cutting. If you don’t mind it being a little soft and crumbly, go ahead and cut it warm.