Preheat the oven to 350°F (180°C). Lightly oil one 9x13 cake pan or two round 9 inch pans. Set aside.
Add the butter, sugar, eggs and vanilla to a big mixing bowl. Beat with an electric beater until thoroughly combined.
Add the rest of the ingredients to the bowl and beat for 30 seconds on low. Beat for another 2 minutes on high.
Pour the batter into the pan or pans of your choice and bake for 30-40 minutes or until a knife comes out clean from the center of the cake. Let cool before icing.