Grease and lightly flour two 9-inch round cake pans. Combine flour, baking powder, and salt. Beat butter about 30 seconds. Add sugar and vanilla; beat until well combined. Add eggs, one at a time, beating 1 minute after each. Add dry ingredients and milk alternately, beating after each addition. Turn into pans. Bake at 375 for 30 to 35 minutes or until cake tests done. Cool 10 minutes in pans. Remove from pans and cool on wire racks.