Irish Cream Tiramisu

Name: Irish Cream Tiramisu
Prep time: 20 min
Total time: 20 min
Yield: 12
Ingredients: 1½ cups espresso or very strong black coffee, cooled; 1 cup Baileys Irish Cream, divided; 14 oz (or two 7-ounce packs) Savoiardi cookies or ladyfingers (see note), although you won't use all of them; 2 large eggs; ⅓ cup superfine sugar (to make your own, process regular granulated sugar in food processor for 30 seconds until fine); 1 pound mascarpone cheese; 2½ teaspoons natural unsweetened cocoa powder, such as Hershey's