Chocolate Covered Katie: The Healthy Dessert Blog, and I absolutely loved it! I followed the recipe below, and as seen in the picture, it only filled half of the mug. (I suggest doubling the recipe to completely fill the mug.)
Milk, Egg, Soy, Nut, and Peanut Free
2 tbsp flour
1/4 tsp baking powder
1/16 tsp salt
1 tbsp sugar
1 tbsp plus 2 tsp water
2 tsp melted milk free, soy free margarine (can be substituted for oil or applesauce)
1/4 tsp pure vanilla extract
1/8 tsp cinnamon
1 and 1/4 tsp brown sugar
1/4 to 1/2 tsp melted milk free, soy free margarine (can be substituted for oil or applesauce again)
Tiny pinch of salt
Combine dry batter ingredients and mix. Add wet batter ingredients in and mix. In a separate bowl, mix streusel ingredients. Put half of batter in the mug, then layer on top half of the streusel. Add the second half of the batter, and on top of that the other half of the streusel. Bake in the microwave for about 1 minute. However, the time may vary depending on your microwave, so add 10 seconds on until you find it desirable.
Please remember to double check all ingredients for your food allergens. Enjoy!