In a large mixing bowl, combine the flour, baking powder, salt, and ground cinnamon. Mix well.
Add the mashed pumpkin, melted butter, and sugar to the dry ingredients. Stir until combined.
Gradually add warm water, mixing until a soft dough forms. If the dough is too sticky, add a little more flour; if it's too dry, add more water.
Knead the dough on a lightly floured surface for about 5 minutes until smooth.
Roll out the dough to about 1/4-inch thickness. Cut into circles or squares using a cookie cutter or knife.
Heat vegetable oil in a deep skillet over medium heat. Once hot, carefully add the sopaipillas to the oil, frying in batches until golden brown on both sides (about 2-3 minutes per side).
Remove the sopaipillas from the oil and place them on paper towels to drain excess oil.
Serve warm, drizzled with honey.