Eggnog Poke Cake

Name: Eggnog Poke Cake
Ingredients: 1 cup flour; 1 teaspoon baking powder; 1/2 teaspoon ground cinnamon; 1/2 teaspoon salt; 1/4 teaspoon freshly grated nutmeg, plus more for topping; 3 eggs, divided; 3/4 cup sugar; 2 cups store-bought eggnog (or a recipe of your own); 1/3 cup whiskey; 1 cup heavy whipping cream; 1/4 cup confectioners sugar; 1 teaspoon vanilla extract