I've lauded this place before, but after visiting last weekend, I will do it again. I consider it now the best cupcake in the DC area.
This is a professional cake place in a strip mall right near the exit for 198 off the BW Parkway. They specialize in cakes for birthdays etc. But they always have the cupcakes on hand (they also sell professional pastry equipment).
You can get your cupcakes with any combination of yellow or chocolate cake, and vanilla or chocolate buttercream icing. The cake is dense, moist and tender. The icing is smooth, not too sweet and doesn't taste like a stick of sugared butter. Moreover, they don't have to be "at room temperature to be enjoyed".
At 80 cents per cupcake, they are a bargain compared to prices at established places in the district. If you are heading to BWI, Pasta Plus or anywhere else in the area, I highly recommmend a pit stop.