Maple Nut Muffins

These maple nut muffins are not exactly low-cal, but they are tasty.  It must be all that butter.  I do love butter. 
The recipe came from Country magazine, and here's the link:  Morning Maple Muffins.  The only change I made was to use low-fat plain yogurt instead of the sour cream; my yield was 12 muffins instead of 16.
Any good cooking going on at your house?