Step 1Heat the oven to 375 degrees. Grease 1 (12-cup) or 2 (6-cup) muffin tins.
Step 2Sift together the whole-wheat and all-purpose flours, the baking powder, baking soda and salt.
Step 3In another bowl, beat together the eggs, oil, vanilla, yogurt, milk and maple syrup. Quickly combine the dry and wet ingredients, and fold in the pecans. Spoon the batter into the muffin cups, filling them 2/3 full.
Step 4Bake the muffins until brown and firm, 20 to 25 minutes. Remove them from the oven and allow the muffins to cool in the tins for 5 or 10 minutes before removing and cooling on a rack.