Gingerbread Cake with Cream Cheese Frosting

Name: Gingerbread Cake with Cream Cheese Frosting
Ingredients: 2 1/2 cups all-purpose flour (see Cook's Note); 2 sticks (1 cup) unsalted butter, at room temperature, plus more for the baking pans; 1 tablespoon ground ginger; 2 teaspoons baking soda; 1 teaspoon ground cinnamon; 1/2 teaspoon freshly grated nutmeg; 1/4 teaspoon ground cloves; 1/4 teaspoon fine salt; 3/4 cup packed light brown sugar; 2 large eggs; 1 teaspoon pure vanilla extract; 3/4 cup unsulphured molasses; 1 cup boiling water; 8 tablespoons (1 stick) unsalted butter, at room temperature; One 8-ounce package cream cheese, at room temperature; 4 cups (1 pound) confectioners' sugar; Milk, as needed for thinning; 1/2 cup white chocolate chips; 20 to 24 mini gingerbread men cookies, depending on size; Red, green and white nonpareils, for sprinkling