Vanilla bean cupcake with blackberry buttercream

Sarah Howard at Creative Loafing's Daily Loaf blog posted this vanilla cupcake with blackberry buttercream...and the recipe! She writes:

When it comes to creating the perfect cupcake, simplicity is best. I like to make a basic vanilla cake that can be paired with a variety of frostings and toppings depending on your mood, and will be subtle enough in flavor to carry an extra rich buttercream. The cake featured here calls for whole eggs along with an equal ratio of egg whites to keep it light and fluffy and maintain the pure color. The use of the vanilla bean makes a big difference in the fragrance and overall taste of the cake as well, so go ahead and splurge in the spice aisle. After you’re done scraping out the tiny seeds, throw the pod into a mason jar with baker’s sugar, keep it in the cupboard and use the vanilla-infused sweetness to add an extra dimension to your recipes.