Double Chocolate & Peanut Butter Streusel muffins

Okay, maybe I’m exaggerating a bit by calling these “muffins”. The crumb is so light and soft and chocolatey, that it’s really hard to tell it apart from a chocolate cupcake. But in the absence of frosting (and the appearance of streusel, which is definitely a “muffin thing”), we’ll go ahead and call these muffins. …