How to Make It
Heat oven to 350° F. Butter a 9-by-13-inch or another shallow 3-quart baking dish. In a large saucepan, bring 6 cups of water and 2 teaspoons salt to a boil. Gradually whisk in the polenta. Cook over medium heat, whisking often, until the polenta is very thick, 10 to 15 minutes.
Remove from heat and whisk in the butter, eggs, and 1 cup of the Parmesan. Transfer to the prepared baking dish and sprinkle with the remaining ¼ cup of Parmesan. Bake until the top is set and golden, 30 to 35 minutes. Let cool for 10 minutes. Serve in the baking dish.