No big secret here, Snow White Cupcakes are the most simple vanilla cupcakes you could make.
Simply prepare a box of white cake mix using the egg whites recipe on the box. Before you call this lazy, keep in mind that boxes of cake mix (which are frequently on sale!) often end up being cheaper than the ingredients required for cake mix made from scratch, especially if you have no plans to use leftover ingredients.
Then all you have to do is slather them with vanilla frosting! You can decorate further if you wish, or leave snow-white. My biggest tip is not to use store-bought frosting. It is usually inferior in taste and full of trans fats. Some shortcuts are worth it, but ready-made frosting is not one of these shortcuts.
Vanilla Buttercream Frosting:
1 cup butter (two sticks) - room temperature
4 cups powdered sugar
2 tsp clear vanilla
1/4 cup skim milk
1. With an electric mixer, cream the butter.
2. Add milk and vanilla.
3. Add powdered sugar and beat, one cup at a time, until smooth.