Sweet Potato Streusel Muffins

1/4 c. butter

1/2 c. sugar

1 egg

1 T. vanilla

3/4 c. mashed sweet potato

1 t. ginger

1 t. cinnamon

2 c. flour

2 t. baking powder

1 t. salt

1 c. milk

In mixer, beat Butter  well with sugar.  Add egg,  vanilla,  mashed sweet potato,  ginger,and cinnamon, mix well.  Sift together flour,  baking powder,  salt.  Add to butter mixture alternately with milk until you have used up all of the milk and flour beating in between each addition.   Fill muffin cups about 3/4 full and top with streusel mixture.

Streusel mixture:

1/2 c. sugar

1/4 c. flour

1 t. cinnamon

1/3 c. granola

1 T. butter

With a pastry cutter, mix all streusel ingredients together until crumbly.  Put onto each muffin before baking.  Bake muffins at 350 degrees for 25 minutes.