Whole-Wheat Ginger-Squash Muffins with Chocolate Chips

One last(?) squash purée recipe for the season! I live in a country where the only cold cereals available at regular grocery stores (Tokyo Metro, you don’t count) are frosted flakes and cocoa puffs.*  As a result, I’ve learned to make a variety of breakfast foods. I’m actually not sure how I only ended up…