Buns:
1 package dry yeast (about 2 1/4 teaspoons)
1/4 cup warm water (100° to 110°)
2 3/4 cups all-purpose flour, divided $
1/2 cup Pumpkin Puree $
1/2 cup 1% low-fat milk $
1/4 cup butter, melted $
1 tablespoon granulated sugar $
1 1/4 teaspoons salt
1/4 teaspoon ground nutmeg
Cooking spray $
3 tablespoons granulated sugar $
3 tablespoons brown sugar
2 tablespoons all-purpose flour $
1 1/2 teaspoons ground cinnamon
2 tablespoons chilled butter, cut into small pieces $

Glaze:
3/4 cup sifted powdered sugar
1 tablespoon hot water
1/4 teaspoon vanilla extract