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Preheat oven to 375° F. Grease or paper-line 18 muffin cups.
Combine flour, dry milk, 1 cup brown sugar, 2 teaspoons pumpkin pie spice and baking powder in large bowl. Mix pumpkin, butter, eggs and water in small bowl. Add to flour mixture; stir just until moistened. Spoon into prepared muffin cups, filling 2/3 full.
Combine remaining 1/2 cup brown sugar and 1/2 teaspoon pumpkin pie spice in small bowl. Sprinkle 1 heaping teaspoon over each muffin.
Bake for 18 to 20 minutes or until wooden pick inserted in center comes out clean. Cool in pans on wire racks for 5 minutes; remove to wire racks to cool. Serve warm. Store any remaining tightly covered.