Pastry: Measure flour, baking powder, salt, spices, and sugar into medium mixing bowl. Stir. Cut lard into 12 pieces and drop into flour mixture. Cut lard in with a pastry blender until crumbly. Pour in water and mix with a fork until dough begins to form a ball. Mold dough into a smooth ball with hands, adding a sprinkle of water if needed. Wrap in waxed paper and chill 1 hour.
Filling: Melt butter in saucepan over low heat. Add sugar, spices, and pumpkin and stir until smooth. Stir over low heat 10 to 15 minutes, until mixture thickens. Pour into a bowl and let cool to room temperature. Then chill, uncovered, in refrigerator until completely cold.
Egg Wash: Crack egg into a small bowl. Beat with whisk and stir in water. Set aside.
Preheat oven to 375°F Divide dough in half and pat into 2 balls. Rewrap and refrigerate 1 ball. Flatten other ball with hand, then roll disk to 1/4 inch thick on lightly floured surface. Cut 4 inch circles with cookie cutter; reroll and cut scraps.
Use pastry brush to paint egg wash around the edge of each circle. Put about 1 tablespoon filling in center of each circle, and fold in half over filling. Press edges with fingers, then crimp with floured tines of a fork. Place empanaditas 1 inch apart on ungreased cookie sheet. Repeat with other half of dough and filling.
Brush tops of empanaditas with egg wash and prick center of each with fork to form steam vents. Bake 15 to 20 mintues, or until lightly browned. Remove from oven and sprinkle with a bit of sugar while still hot. Allow to cool for several minutes before serving; filling will remain very hot.