DIRECTIONS: Put oven rack in middle positiona nd preheat oven toe 350F. Put liners in muffin cups. Whisk together flour and baking powder in a small bowl. Whisk together pumpkin, oil, eggs, pumpkin-pie spice, 1.25 cups sugar, baking soda, and salt in a large bowl until smooth, then whisk in flour mixture until just combined. Stir together cinnamon and remaining 1 tablespoon sugar in another bowl. Divide batter among muffin cups (each should be about 3/4 full), then spinkle tops with cinnamon-sugar mixture. Bake until puffed and golden brown and a wodden pick or skewer inserted into center of a muffin comes out clean, 25 to 30 minutes. Cool in pan on a rack 5 minutes, then transfer muffins from pan to rack and cool to warm or room temperature