Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a saucepan, bring water, butter, and salt to a boil. Add flour and nutmeg all at once; stir until a smooth ball forms. Remove from heat; let stand 5 minutes.
Add eggs, one at a time, beating well after each addition. Continue beating until mixture is smooth and shiny.
Drop dough by rounded tablespoonfuls onto the prepared baking sheet. Bake for 20-25 minutes or until golden brown. Remove to wire racks to cool.
For the whipped cream, beat heavy cream until soft peaks form. Gradually add confectioners’ sugar, eggnog, vanilla, and nutmeg; beat until stiff peaks form.
Split cream puffs in half. Fill with whipped cream. Replace tops and dust with confectioners’ sugar.
Notes
Store cream puffs in the refrigerator. Serve chilled.