Preheat the oven to 350°F (180°C) regular oven. Line a large cookie sheet with parchment paper.
Let the butter melt in a medium saucepan. Once melted, cook for around 3-4 minutes, stirring regularly until the milk solids have caramelized and the butter smells nutty.
Pour the hot butter into a large heat-proof bowl and let it cool down for 10 minutes.
Spoon your pumpkin puree onto a plate. Place a layer of paper towel over the top. Press down gently to absorb excess moisture. Repeat this to remove as much excess liquid as possible. The finished puree should be dryer and thicker, like play dough.
Whisk together the flour, spices, baking powder, baking soda and salt in a small bowl and set aside.
To the cooled butter, add brown sugar, egg, vanilla and pumpkin and whisk until smooth and glossy.
Add the dry and wet ingredients to fold into a thick dough.
Finely chop the candied ginger. Add this to the dough and stir until just combined.
Use a cookie scoop to roll tablespoon-sized balls of dough. Roll each cookie dough ball into a bowl of granulated sugar, coating all sides.
Place the cookies spaced out on the prepared baking sheet. Gently press down the tops of the cookies a bit to lightly flatten them.
Bake the cookies in the preheated oven for 10-11 minutes until they have puffed up and the edges are golden brown. The cookies will still be very soft. Don't overbake them, otherwise, they will become cakey.
Let the baked cookies cool on the baking tray for 5 minutes, then transfer to a wire rack to cool to room temperature.