Step 1: Preheat oven to 350°f (177°c).
Step 2: sift the flour and baking powder together. Set aside.
Step 3: in another large bowl, cream the butter with an electric mixer until smooth.
Step 4: add the sugar gradually and beat about 3-4 minutes.
Step 5: add the eggs one at a time, beating thoroughly after each addition.
Step 6: beat in the vanilla.
Step 7: finally, add flour mixture alternately with milk.
Step 8: bake for 25-40 minutes until the cake springs back when touched.