A few classic baking ingredients...
Plus some brown sugar and walnuts to give it that coffee cake crunch. I used the left-over co-op walnuts that I used for my pesto earlier in the week.
I intentionally over-filled the tin to get extra big muffins, so, on Bittman's direction, I filled in the extra spaces with water.
The final products were excellent; they were really moist, and the cinnamon brown sugar top was super tasty. They were the perfect addition to a cup of coffee and a long conversation with an old friend.