Preheat oven to 375 and spray a mini muffin pan with cooking spray or use paper liners. Set aside.
In a medium bowl, combine the flour, baking powder, salt, cinnamon, pumpkin pie spice, and nutmeg.
In a separate bowl, combine the melted butter and brown sugar, whisking until combined.
Add in the egg and vanilla.
Stir in the pumpkin and milk.
Once combined, pour the wet mixture into the dry mixture and stir until just combined.
Using a spoon, scoop batter into each muffin cup, filling about 2/3 full.
Once complete, place pan in oven and bake for about 10-12 minutes.
Remove from oven and place mini muffins on cooling rack.
While muffins are cooling slightly, melt the butter in a small dish.
In a separate small dish, combine the sugar and cinnamon.
Dip each mini muffin into the melted butter, followed by the cinnamon/sugar mixture.
Serve and enjoy!