
Change it Up:
For a little healthier version, substitute half of the flour with whole wheat flour. You may want to add an extra one to two tablespoons of sour cream or reduce your cooking time, as I've found that wheat flour can quickly dry these out if not careful.
Dress it Down:
Eliminate the clove, allspice and nutmeg for a little simpler version.
Eliminate the chocolate chips for a strictly pumpkin muffin (although I'm not sure why you'd want to remove the chocolate!)