Lightened Up Streusel - Filled Coffee Cake

Servings - 16   Serving Size - 1/16th of cake   Points Plus per Serving - 4 Points+
Calories - 143.4,   Total Fat - 4.9g,   Carb. - 25.7g,   Protein - 2.1g,   Fiber - 0.3g

Servings - 12  Servings Size - 1/12th of cake   Points Plus per Serving - 6 Points+
Calories - 191.2,   Total Fat - 6.5g,   Carb. - 34.2g,   Protein - 2.8g,   Fiber - 0.5g

Cake Batter:
1 1/2 cups cake flour
3 tsp. baking powder
1/4 tsp. salt
1/2 cup granulated sugar
1/4 cup unsalted butter, cold room temp and cut into small pieces
1 egg
3/4 cup low fat buttermilk ( you could use 1/2 cup skim milk instead, it won't change nut stats much)
2 tsp. pure vanilla extract

Streusel Filling:
1/2 cup dark brown sugar, packed
2 TBS all purpose flour
2 tsp. ground cinnamon
2 TBS unsalted butter, melted

1.  Preheat oven to 375 degrees F.  Spray an 8" x 8" baking dish with a cooking spray with flour added ( like baker's joy)   OR grease and flour pan.  Set aside.   In large mixing bowl, combine the cake flour, baking powder, salt and granulated sugar.  Cut in cold butter pieces with a pastry blender until the mixture is like fine cornmeal.  ( you could also do this in a food processor to save time)  Set aside. 
2.  In a small bowl, combine the ingredients for the streusel topping.  Set aside.
3.  In another small bowl or glass measuring cup, combine the egg, buttermilk and vanilla extract.  
4.  Pour the wet ingredients into the large bowl with the dry cake ingredients.  Mix to just combine.  DO NOT OVERWORK...or you will get a tough cake. 
5.  Spoon half the cake batter into the prepared baking pan. Sprinkle half the streusel mixture on top.  Top that with the remaining batter and then repeat with remaining streusel.   ( Unbaked cake and be covered with plastic wrap and  put into refrigerator at this point for baking at a further time.  Just bring it out of the refrigerator and let it come to room temp and remove plastic wrap before baking)
6.  Bake cake at 375 degrees F for 20 - 30 minutes, or until done.  Best enjoyed warm!