Instructions

  1. Mix brown sugar walnuts and cinnamon together and set aside.
  2. Muffin: Mix butter, sugar and eggs.
  3. Add sour cream and vanilla.
  4. Add dry ingredients.
  5. Marble the brown sugar mixture through the batter using a table knife.
  6. Reserve a few tablespoons for sprinkling on top.
  7. Fill 12 greased muffin cups.
  8. Sprinkle remaining brown sugar mix on top of each.
  9. Bake at 375 degrees for 22 minutes.
  10. Remove from pan and cool.