Made a lottle more than a dozen. Made 18 muffins for me with the changes I made.
Swapped:
sugar with 1/2c brown sugar
Oil to apple sauce
Added:
1/4c peanut butter
1/2 tsp cinnamon
Dropped oven temp to 375° for 18 min
400 was over browning the tops, and leaving a thin strip of raw batter on the inside of the bottom of the muffins.