Blueberry Muffin With Streusel Topping Mug Cake

Directions

1. 1
   Mix everything listed in muffin ingredients except blueberries into a microwave safe mug with a small whisk. Drop blueberries in, spreading them out. In a small bowl, mix streusel ingredients, until butter pieces are completely coated in the flour, sugar, and cinnamon.
2. 2
   Sprinkle small crumbles of streusel on top of muffin batter, spreading out evenly across the surface.Cook in the microwave for about 1 minute.
3. 3
   Let cool for a few minutes before eating.