Preheat oven to 400 degrees and spray a regular size muffin tin with non-stick spray.
In a large bowl combine DRY ingredients: Flour, baking powder, salt, cinnamon, allspice, ginger, and nutmeg. Mix well.
In a small bowl combine WET ingredients: Brown Sugar, pumpkin, milk, and oil. Mix well, and break up any brown sugar clumps. <br> <br><i> You can stop the recipe here and refrigerate the wet ingredients until morning, or keep going.</i><br><br>
Stir the wet ingredients into the dry ingredients until just combined.
Use a large cookie/ice cream scoop to portion the batter into each muffin cup. Each cup should be about 2/3 full. (If using nuts, sprinkle on top here.)
Bake for 18-20 minutes, and rotate pan halfway through baking.
Remove from oven, and place muffin tin on cooling rack. Serve, or dip and roll warm muffins in melted butter and cinnamon sugar topping.