|Heat oven to 350°. Line cookie sheets with parchment paper.In a bowl combine the flour, soda, baking powder, cinnamon, nutmeg, and salt. Mix to blend well, then set aside.
In a large bowl with electric mixer, beat the brown and granulated sugars with the softened butter until light. Beat in the pumpkin puree, egg, and vanilla. Slowly incorporate the flour mixture. Turn off the mixer, scrape the paddle and bowl, and blend the rest of the cookie dough by hand, til all of the flour is incorporated. The dough will be very sticky. Chill for an hour, then make cookies: drop rounded teaspoons or cookie scoops onto the prepared baking sheets.
Bake for 5 minutes, rotate cookie pans in over, bake for another 3 minutes. Check cookies: edges should just begin to brown. Bake a few minutes longer, if necessary. Remove from oven and let cookies cool.
Drizzle the glaze with a spoon on the cooled cookies.
Makes about 3 1/2 to 4 dozen cookies.
Brown Butter Glaze