In a large bowl, stir together flour, brown sugar, baking powder, baking soda, cinnamon, ginger, nutmeg, and salt. In another bowl, mix egg, milk, pumpkin, yogurt, and butter until well blended. Stir egg mixture into flour mixture just until evenly moistened.
Place a nonstick griddle or a 12-inch nonstick frying pan over medium heat (350°); when hot, coat lightly with butter and adjust heat to maintain temperature. Spoon batter in 1/3-cup portions onto griddle and gently spread into 4-inch rounds. Cook until pancakes are browned on the bottom and edges begin to look dry, 2 to 3 minutes; turn with a wide spatula and brown other sides, 2 to 3 minutes longer. As pancakes are cooked, transfer to baking sheets and keep warm in a 200° oven. Serve warm with candied-ginger butter and maple syrup.
Candied-ginger butter: In a bowl, with a wooden spoon, stir 2 tablespoons finely chopped candied ginger into 1/4 cup (1/8 lb.) soft butter (soften in a microwave oven on full power [100%] for 5 to 10 seconds). Chill until firm before serving. Makes about 1/4 cup.
Nutritional analysis is per pancake.