1) Use a dark chocolate bar that is mint flavored, rather than a mint cream-filled dark chocolate bar. For this recipe, try the Endangered Species brand Dark Chocolate with Deep Forest Mint, or Cocoa Camino's Mint Chocolate Bar (exceptionally good)!
2) If you want to use unbleached all purpose flour instead of spelt, use just 1 cup. If batter seems too dry or thick whichever flour you are using, stir in another 1–2 tsp each of oil and maple syrup.
3) For the holidays, make these cookies festive by sprinkling 1–2 tbsp crushed or chopped candy canes on cookies before baking, and lightly press in.