In a medium bowl, mix together the flour, baking powder, salt, and cinnamon.
In a larger bowl, beat the egg together with the sugar, then mix in the pumpkin puree, melted butter, maple syrup, vanilla, and orange zest. Add the flour mixture and stir to combine. Fold in the cranberries.
Grease a 12 cup muffin pan, or line wells with paper muffin cups. Divide the batter evenly between each of the 12 cups. Top evenly with the pepitas.
Bake muffins at 350 degrees until puffed and golden brown on top, about 30 minutes. Cool slightly before serving.