The "double" in this cupcake title and recipe comes from having a chocolate chip cookie on top and a cookie dough center! Love it. It's by blogger Putzing Around in the Kitchen, who has the recipe, and writes:
In case you were wondering, moist chocolate cupcakes stuffed with chocolate chip cookie dough and frosted with the richest, creamiest, most chocolate-y buttercream you’ve ever tasted = super amazing. Unsurprisingly, these cupcakes were a huge hit at work. People raved about the frosting, and everyone loved the surprise cookie dough center.