Preheat oven to 350 degrees F. Prepare two 8-inch round pans. (Spray with baking spray, grease with butter and flour, or use GOOP)
Sift together the flour, baking powder, and salt in a medium bowl and set aside.
In the bowl of a stand mixer fitted with paddle attachment, cream together the butter and sugar until light and fluffy, about 5 minutes.
With the mixer now on low, beat in the eggs one at a time, then add in the vanilla, lemon extract, and lemon juice.
(With mixer still on low) Add in the flour mixture alternately with the milk, mixing just until incorporated. (about 30 seconds)
Pour batter into prepared pans.
Bake in the preheated oven for 24-30 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool in pans on wire racks for 10 minutes then invert onto wire racks to cool completely.