Preheat the oven to 350ºF.
Combine the yeast and the warm water in the bowl of a stand mixer fitted with the dough hook. Let sit for 10 minutes.
Combine the flour and salt in a separate bowl.
Add the olive oil to the yeast, then add the flour mixture. Mix the dough on low speed until the wet and dry ingredients combine, then increase the speed to medium and knead the dough until it is soft, about 2 minutes. Use a spatula to scrape down the sides, then add the parmesan and black pepper and mix just until combined.
Grease a 13x9" baking pan.
Grease your hands with olive oil then transfer the dough to the prepared pan, using your hands to spread it out. Use your fingertips to make small indentations on the top of the dough then cover it with plastic wrap and let it proof in a warm, dry place (such as your dryer) for one hour, or until it doubles in size.
Bake the focaccia for 20 minutes, remove it from the oven, and sprinkle it with the remaining ¼ cup Parmesan cheese and a final drizzle of olive oil. Return the pan to the oven and bake it an additional 2 minutes, just until the cheese melts.
Remove the pan from the oven and let the focaccia cool before slicing and serving.
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