Preheat your oven to 350°F. Grease a mini muffin pan or line with paper liners.
In a medium bowl, mix the flour, baking powder, salt, cinnamon, ginger, and nutmeg together.
In a large bowl, whisk together the pumpkin purée, granulated sugar, brown sugar, melted butter, egg, vanilla extract, and milk until smooth.
Combine the dry ingredients with the wet ingredients and stir until just mixed. Refrain from overmixing to ensure the muffins stay tender.
Spoon the batter into the mini muffin cups, filling each about 2/3 full to allow space for rising.
Bake in the preheated oven for 15-20 minutes until a toothpick comes out clean. Cool the muffins in the pan for 5 minutes, then transfer to a rack. Enjoy your mini pumpkin muffins warm or at room temperature.