- 10 minutes
- 30 minutes
- Preheat the oven to 450 degrees F. Melt the butter in a skillet over medium-high heat. Add the corn and 1/2 teaspoon salt and cook until tender, 5 to 6 minutes. Add the scallions and cook until soft, about 1 minute.
- Spread the chili in an 8-inch-square baking dish. Top with half of the cheese followed by half of the corn mixture. Lay the polenta rounds on top, then sprinkle with the remaining corn and cheese.
- Bake until the casserole is heated through and the top is golden, about 20 minutes. Let stand 5 to 10 minutes before serving.