In a medium bowl, combine the crumb topping ingredients with your hands and set aside.
Banana Muffins
In a large mixing bowl, using either a stand mixer or electric hand mixer, cream together the butter and brown sugar. Add the banana and incorporate. Add the eggs, one at a time. Then add the buttermilk and vanilla.
Scrape the bottom and sides of the bowl occasionally. Add the flour, baking soda, powder and salt and mix until incorporated. Fold in the chopped pecans.
Spoon or scoop muffin batter evenly into 12 paper lined muffin tins. Spoon crumb topping over each muffin.
Bake in a preheated 375 degree F oven for 22 to 25 minutes, or until a toothpick when inserted comes out clean.
Notes
Banana MuffinsIf you cannot find wheat germ you can substitute whole wheat flour.