Preheat oven to 350°F / 175°C.
Beat together the pumpkin, brown sugar, & maple syrup in a stand mixer on low speed, or by hand.
Add eggs one at a time, then slowly pour beer into the batter. Mix until smooth.
Pulse oats in a blender until finely ground, but not quite a powder.
Add oat flour, baking powder, cinnamon, ginger, cloves, & salt to the batter. Mix just until combined.
Pour batter into a loaf pan lined with parchment paper. Sprinkle pepitas on top and press lightly into the batter.
Bake at 350°F / 175°C for 60-75 minutes, until a toothpick in the center comes out clean.
Let cool in the pan for 15 minutes, then remove to a wire rack and finish cooling for another 15 minutes before slicing.