blueberry mug cake

BLUEBERRY MUFFIN WITH STREUSEL TOPPING MUG CAKE
INGREDIENTS:

Muffin:
1/4 cup flour
2 tbsp granulated sugar
1/8 tsp baking powder
1/16 tsp baking soda
3 tbsp fat free milk
1 tbsp vegetable oil
7 fresh blueberries

streusel topping:
1 tbsp cold butter, chopped into tiny pieces
1 1/2 tbsp flour
2 1/2 tbsp brown sugar
1/8 tsp cinnamon

DIRECTIONS:

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. Sprinkle small crumbles of streusel on top of muffin batter, spreading out evenly across surface.
2. Cook in microwave for about 1 minute. Let cool for a few minutes before eating.