01 - Preheat oven to 350°F (175°C). Grease a 12-cavity donut pan or line a muffin tin with paper liners.
02 - Whisk flour, baking powder, baking soda, salt, ginger, cinnamon, nutmeg, and cloves together in a medium mixing bowl.
03 - Whisk pumpkin purée, brown sugar, melted butter, eggs, molasses, and vanilla extract in a large bowl until smooth.
04 - Add dry ingredients to the wet mixture and stir gently until just combined. Avoid overmixing to prevent tough donuts.
05 - Spoon batter into prepared donut pan or muffin tin, filling each cavity approximately three-quarters full.
06 - Place pan in oven and bake for 13 to 15 minutes, or until a toothpick inserted into the center comes out clean.
07 - Allow donuts to cool in the pan for 5 minutes, then transfer to a wire rack for additional cooling.
08 - Brush donuts with melted butter while still warm, then roll in cinnamon sugar mixture for added flavor and texture.
09 - Enjoy donuts warm or at room temperature.