Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners or grease it lightly with non-stick spray.
In a large mixing bowl, whisk together the all-purpose flour, whole wheat flour, baking powder, ground ginger, ground cinnamon, nutmeg, cloves, and salt until well combined.
In another bowl, whisk together the milk, molasses, brown sugar, egg, and melted butter until smooth.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix; some lumps are okay.
If using, fold in the chopped walnuts for added texture and flavor.
Spoon the batter into the prepared muffin tin, filling each cavity about 2/3 full.
Bake for about 15-18 minutes or until a toothpick inserted into the center of a muffin comes out clean.
Let the muffins cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.
Notes
Serve warm with drizzles of maple syrup on top and a sprinkle of cinnamon for an extra festive touch.