In a coffee mug or cup soften 1/2 tablespoon of butter in microwave for 5 seconds. Then stir in the sugar and brown rice syrup, mixing well. Add in the applesauce, vanilla, flour, baking powder, salt, stirring until just combined. Add in the blueberries and gently mix in to the batter.

In a separate bowl, combine all streusel ingredients with your finger, working the butter in to a sandy like texture (I left a few clumps to have some streusel chunks). Pour topping over the cake batter.

Cook cake in the microwave for 75 seconds. You don’t want to over cook the cake, but you want the top to be just set. Get your spoon ready and go to town!