Preheat your oven to 350.
Cream together eggs and sugar, mix for a couple minutes.
Add in butter, vanilla and baking power.
Add in flour and milk, mix thoroughly.
For cake - use two 9x9 pans and bake for 30-40 minutes until set in the center and the toothpick comes out clean.
For cupcakes - fill 3/4 full and bake for 20-25 minutes until the toothpick comes out clean.