Sweet potato muffins with streusel topping

I think muffins are good any time of the year!  Especially with a good cup of tea or coffee!

Ingredients:
1 egg
1/3 cup softened unsalted butter
2/3 cup sugar ( I used sugar in the raw)
1 tsp vanilla
1 3/4 cup whole wheat white flour
1 1/2 tsp baking powder
1 tsp cinnamon
1/2 tsp pumpkin pie spice
1/2 tsp salt
2/3 cup half-n-half, plus 1-2 TBL more
2 medium sweet potatoes, steamed, and jackets removed
zest from 1 orange

Streusel topping:
1/2 cup whole wheat white flour
4 TBL unsalted butter softened
1/2 tsp cinnamon

***OPTIONAL***
Orange glaze:
1/2 cup powdered sugar
Juice from 1 orange
1 tsp orange zest

Whisk together till sugar dissolves.


Directions:
Preheat oven to 375.
Cream egg, butter, and sugar in the bowl of a stand mixer.  Add vanilla and flour and mix.  Add the remaining ingredients and mix with the wire whip until thoroughly blended.  The half-n-half amount may need to be adjusted according to how you like the batter.  Spray muffin tins with non stick spray.  Fill tins halfway and top with streusel topping.  Bake at 375 for 20-25 minutes.
**NOTE**  I did 6 large muffins, 12 mini muffins, and a mini loaf (7X4).  The loaf took over half an hour to bake.  Just keep checking if you decide to make a loaf.  Stick with a toothpick to make sure it's done.