Combine dry ingredients together with the wet batter and beat until smooth (don't over mix). Preheat your oven to 350 degrees. Grease 24-30 muffin tins and line with paper liners. Fill the muffin cups 2/3 of the way full and prepare the strudel topping.
Melt the butter slightly and combine with the brown sugar, flour and cinnamon. Break up the streudel topping into small pieces. Place 1-2 T. of the strudel mixture on top of each muffin.
Bake the muffins for 18-22 minutes in a preheated oven, until a toothpick inserted into the center of the muffin, comes out clean. Cool muffins in the pan or on a wire rack.