Preheat the oven to 350 degrees F. Lightly grease a 12-hole muffin tin.
Mix the flaxseed, baking powder, cinnamon, nutmeg, salt, and sugar together in a large mixing bowl. Add the remaining ingredients and beat together until well combined.
Let the batter rest for 10 minutes.
Divide the batter into the 12 muffin holes and bake for 16-18 minutes, or until a toothpick inserted into the center comes out clean.