Step 1

Preheat oven to 350 degrees. Butter a 9-by-2-inch round cake pan. Line bottom with parchment; butter parchment. In a large bowl, whisk together flour, baking powder, instant espresso powder, pumpkin-pie spice, and salt. In another bowl, whisk eggs into pumpkin puree, then whisk in butter, sugars, and milk. Whisk wet ingredients into dry ingredients.

Step 2

Scrape batter into prepared pan. Bake until top springs back when lightly touched, 35 to 40 minutes. Let cool in pan on a wire rack 10 minutes. Turn out onto rack and let cool completely, about 2 hours.

Step 3

Whisk cream with confectioners' sugar until soft peaks form; dollop on top of cake and dust with espresso powder. Serve immediately.