This cheesy corn casserole is the spoonable, sweet-and-savory side that holds up at a potluck: two kinds of corn, sour cream, eggs and sharp cheddar baked in one 9×13-inch dish to serve 12. It travels well and keeps well on a buffet. USDA FSIS says cooked food that has been heated to 165°F can be kept hot for serving in a preheated slow cooker, as long as it stays at 140°F or above (USDA FSIS, 2026).
Key Takeaways
- Cream-style corn, whole kernels, sour cream and a cornmeal base make it creamy but scoopable.
- Two 8.5-ounce boxes of corn muffin mix can stand in for the dry ingredients.
- One 9×13-inch dish serves 12 as a side.
- Bake at 350°F until the center is set and reads 165°F. The cheese goes on for the last 10 to 15 minutes.
- On a buffet, keep it at 140°F or above, per USDA FSIS.
What Makes This Corn Casserole Potluck-Friendly?
It’s built to wait. Corn casserole has enough cornmeal to hold its shape, so it survives a car ride and an hour on a buffet without collapsing. It bakes at 350°F, the same temperature as our Southern baked mac and cheese, so the two can share an oven, and it reheats well under foil.
Corn casserole and corn pudding are close cousins, and the difference is the cornmeal. Pudding is mostly eggs and cream, so it’s delicate and best straight from the oven. Casserole has a cornbread-style base that gives it structure. That’s why casserole is the one to bring to a potluck, and pudding is the one to make at home.
Ingredients for Cheesy Corn Casserole
Prep Time: 15 minutes | Cook Time: 50 to 55 minutes | Total Time: 1 hour 25 minutes, including resting | Serves: 12 as a side
Dry Ingredients
- 1½ cups yellow cornmeal
- 1 cup all-purpose flour
- ¼ cup granulated sugar
- 1 tablespoon baking powder
- 1¼ teaspoons kosher salt
- ½ teaspoon freshly ground black pepper
Wet Ingredients
- 3 large eggs
- 1 cup sour cream
- ½ cup (1 stick) unsalted butter, melted and slightly cooled
- 2 cans (14.75 ounces each) cream-style corn
- 1 tablespoon softened unsalted butter, for the dish
Mix-Ins and Topping
- 3 cups corn kernels: one 16-ounce bag frozen corn, thawed, or two 15.25-ounce cans, drained
- 8 ounces sharp cheddar, shredded (about 2 cups), divided
- 4 green onions, thinly sliced
- 1 jalapeño, seeded and minced (optional)
- 2 tablespoons chopped fresh chives, for serving
Shortcut: replace the cornmeal, flour, sugar, baking powder and salt with two 8.5-ounce boxes of corn muffin mix. Keep the pepper and everything else. You’ll also need a 9×13-inch baking dish at least 2 inches deep and a rimmed baking sheet.
How to Make Cheesy Corn Casserole
The eggs make this an egg dish as well as a casserole, so bake it until the center reads 165°F. That covers both federal marks, 160°F for egg dishes and 165°F for casseroles (FoodSafety.gov, 2026).
- Heat the oven. Set a rack in the center and heat the oven to 350°F. Grease the baking dish with the softened butter and set it on the rimmed baking sheet to catch drips.
- Prep the corn. Thaw frozen kernels in a colander under cool running water, then pat them dry. Drain canned corn well. Extra water makes the center soggy.
- Whisk the dry ingredients. In a medium bowl, whisk the cornmeal, flour, sugar, baking powder, salt and pepper.
- Whisk the wet ingredients. In a large bowl, whisk the eggs until smooth, then whisk in the sour cream, melted butter and cream-style corn.
- Combine. Add the dry ingredients to the wet and stir just until no dry streaks remain. Fold in the corn kernels, 1½ cups of the cheddar, the green onions and the jalapeño, if using.
- Fill the dish. Spread the batter evenly in the baking dish.
- Bake for 40 minutes, until the edges are golden and pulling away from the dish.
- Add the cheese. Scatter the remaining ½ cup cheddar over the top. Bake 10 to 15 minutes more, until the cheese melts, the center barely jiggles and an instant-read thermometer in the center reads 165°F.
- Rest for 15 minutes so it firms up, then sprinkle with the chives and serve.
Tips and Variations for Corn Casserole
- Dry the corn. Wet kernels are the most common cause of a soggy middle.
- Don’t overmix. Stir in the dry ingredients just until combined so the texture stays tender.
- Adjust the sweetness. Use 2 tablespoons of sugar for a more savory side or ⅓ cup for a sweeter one.
- Use a deep dish. The batter rises a little, and a shallow pan can overflow.
In our kitchen, the scratch version tastes more like corn and less like cake, and you control the sugar. The muffin-mix version is a fine shortcut when the oven and the clock are both full. Either way, bring a big spoon.
Variations
- Green chile: swap the jalapeño for one 4-ounce can of diced green chiles, drained, and use pepper Jack instead of cheddar.
- Bacon: fold in 6 slices of cooked, crumbled bacon with the corn.
- Street-corn style: use crumbled cotija instead of the cheddar topping and finish with lime zest and a pinch of chili powder.
How Far Ahead Can You Make Corn Casserole?
Up to 2 days ahead if you bake it fully, or 1 day ahead if you prep the parts. Either way, cooked food belongs in the fridge within 2 hours and keeps 3 to 4 days, according to USDA FSIS (2026), and anything reheated should reach 165°F.
Prep the Night Before
Whisk the dry ingredients in a covered bowl and leave them on the counter. Whisk the eggs, sour cream and cream-style corn, then cover and refrigerate them with the prepped corn, cheese and green onions. Just before baking, melt the butter, whisk it into the wet mix and combine everything, so the baking powder keeps its lift. Add about 5 minutes to the bake, since the batter starts cold.
Bake Ahead and Reheat
Bake the casserole fully, cool it and refrigerate it, covered, within 2 hours. To reheat, cover with foil and bake at 350°F for 35 to 45 minutes, until the center reaches 165°F. Our meat thermometer guide shows how to get a fast, accurate reading.
Taking It to a Potluck
Carry it hot, wrapped in foil and a couple of towels, for a short drive. For a long buffet, spoon the hot casserole into a preheated slow cooker and check that it stays at 140°F or above. Don’t use the slow cooker to reheat it from cold, which USDA FSIS advises against. Our Friendsgiving potluck guide has more on sharing one oven with a crowd.
Frequently Asked Questions About Corn Casserole
Can I use corn muffin mix instead of cornmeal?
Yes. Two 8.5-ounce boxes replace the cornmeal, flour, sugar, baking powder and salt. Keep the black pepper and every wet ingredient the same. Boxed mix already contains sugar, so the casserole bakes up a little sweeter and more cake-like, which is the version plenty of families grew up with.
Why is my corn casserole soggy in the middle?
It’s usually underbaked, made with wet corn or baked in a dish that’s too small and deep. Pat thawed or canned kernels dry, use a 9×13-inch dish and bake until the center barely jiggles and reads 165°F. Let it rest the full 15 minutes, too, since it keeps setting as it cools.
Can I cook corn casserole in a slow cooker?
We don’t recommend cooking the batter in one. It’s hard to judge when the center is done, and the edges tend to overcook first. Bake it in the oven, then use the slow cooker only to keep it hot at 140°F or above, which is how USDA FSIS advises using one for serving.
Can I freeze corn casserole?
Yes, once it’s baked. Cool it, wrap squares or the whole dish tightly and freeze. Food kept at 0°F stays safe indefinitely, according to USDA FSIS, but we use it within 2 months for the best texture. Thaw overnight in the fridge and reheat covered at 350°F until it reaches 165°F.
Claim the Corn Casserole Slot
Corn casserole is the side you can sign up for with confidence. It’s mostly pantry staples, it bakes in about an hour and it survives the drive. Prep it Wednesday night, bake it Thursday and keep it hot until the plates come out.
Planning the rest of the table? Our 25 Thanksgiving side dishes come with make-ahead notes for each, so you can fit the oven around this one.
