Preheat oven to 350. Grease three round cake pans and line bottoms with parchment.
Cream together sugar and butter. Beat in egg, one at a time. Stir in oil and vanilla.
In another bowl, wisk together dry ingredients. Add alternately with milk, to creamed mixture.
Pour batter between prepared pans. Bake 16-18 minutes. Cool on wire racks.