Preheat oven to 350F degrees; coat a 1 standard 12-cup muffin pan with nonstick spray or coconut oil.
Whisk flours, baking powder, baking soda, salt, nutmeg, ginger, and cinnamon in a small bowl.
Cream butter and brown sugar together in a bowl with an electric mixer until fluffy.
Add eggs, one at a time, beating well after each addition.
Alternately stir dry ingredients and wet ingredients into the butter mixture, starting and ending with the dry ingredients; take care not to over mix.
Fill muffin cups ¾ full and bake 22-25 minutes, or until done. Remove from oven and let cool on baking rack.
While muffins bake, combine granulated sugar, ginger, cinnamon and nutmeg in a shallow dish. When muffins are cool enough to handle but still warm, dip them in the melted butter, and roll in the sugar mixture to coat.
Note: mini muffins are popular at parties.
