Jennifer's Schtuff Muffins

MUFFIN:
about 2 cups schtuff (see list above)
3/4 cup sugar
1 egg
1/3 cup butter
1 1/2 cups flour
1 tsp. baking soda
1 tsp. baking powder
1/2 tsp. salt
1/2 tsp. cinnamon (optional)

STREUSEL: (optional, but really, really good)
1/4 cup sugar
3 TBSP flour
1/4 tsp. cinnamon
2 TBSP cold butter

Preheat oven to 375 degrees. Mash your schtuff. Add wet ingredients and blend. Gently add dry and mix until just moistened. (Overmixing will make rubbery muffins). Scoop into a greased 12 hole muffin pan.
To make the streusel, measure the sugar, flour and cinnamon into a small bowl. Cut the butter in with a fork until incorporated and crumbly. Sprinkle evenly atop muffin batter.
Bake at 375 degrees for 19 minutes or until a toothpick inserted comes out clean.