Place an oven rack in the upper third of your oven and heat to 350°F. Generously butter a shallow 2-quart casserole or gratin dish, or an 11 × 7-inch baking dish.
Cleanup: Use parchment paper to line the baking dish for easier cleaning.
2
Bake the Polenta Base
Pour the stock and milk into the casserole dish, then stir in the polenta, ¼ cup of the Parmesan, and the salt. Bake, uncovered, for 30 minutes, then give everything a good stir. Continue to bake until the polenta thickens somewhat and comes together, 20 to 25 minutes longer.
Tip: Add a dash of nutmeg or smoked paprika for depth.
3
Incorporate the Veggies and Cheese
Stir in the corn, tomatoes, blue cheese, parsley, basil, and scallion. Bake for another 10 to 15 minutes, until very thick and creamy.
Cleanup: Wipe the edges of the dish with a damp cloth before serving for a polished presentation.
4
Broil to Finish
Turn the broiler on high. Sprinkle the remaining ¼ cup Parmesan all over the surface of the polenta and scatter on the butter pieces. Broil until the cheese starts to bubble and develop brown spots all over, 2 to 4 minutes. Watch carefully so it doesn’t blacken.
Tip: For a more savory crust, mix breadcrumbs with the Parmesan before broiling.
5
Serve
Remove from the oven and let the polenta stand for about 10 minutes before serving. Spoon the polenta into individual bowls and sprinkle with more blue cheese, parsley, and basil.
Cleanup: Use a silicone spatula to easily scoop out servings without leaving residue behind.
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