5-Ingredient Crockpot Corn Casserole: The Easiest Holiday Side Step-by-step instructions

Before you start

Before you start, make sure you have a 6-quart slow cooker. If yours is smaller, the casserole will be thicker and may need a few extra minutes of cooking. Drain the whole-kernel corn in a colander and set it aside.

Melt the butter in a small bowl or in the microwave. Have all your ingredients measured and ready to go. The prep is truly minimal, but having everything in place makes the dump-and-go process even smoother.

Instructions

Mix and Spread

1. 1Combine the Ingredients
   In the bowl of a 6-quart slow cooker, add the Jiffy corn muffin mix, drained whole-kernel corn, creamed corn, sour cream, and melted butter. Stir with a spatula until everything is evenly combined and no dry pockets of mix remain. The batter will be thick and slightly lumpy.
   Look for The mixture should be uniform, with corn kernels distributed throughout a thick, creamy batter.
   Tip Drain the whole-kernel corn well so the casserole sets properly; excess liquid can make it too soft.
2. 2Spread Evenly
   Smooth the top of the batter with the spatula so it cooks evenly. Make sure the mixture reaches the edges of the slow cooker insert, leaving no thick spots in the center.
   Look for The surface should be level and the batter evenly distributed across the bottom of the crock.
   Tip If the batter is very thick, it is fine; it will loosen as it cooks.

In this phase, you combine all five ingredients in the slow cooker and spread them evenly. The batter will be thick and slightly lumpy, with kernels distributed throughout.

The mixture should look uniform and reach the edges of the crock. This is a quick, no-fuss step that takes just a few minutes and sets the stage for the slow cooking to come.

Slow-Cook and Set

3. 3Slow-Cook on High
   Cover the slow cooker with the glass lid and set it to HIGH. Cook for 2 1/2 hours without lifting the lid, so the heat stays steady and the casserole can puff and set.
   Look for The casserole will puff up like a soufflé and turn golden at the edges, with a custard-like center.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip Resist the urge to peek; opening the lid releases heat and can slow cooking significantly.
4. 4Check for Doneness
   After 2 1/2 hours, insert a knife or toothpick into the center of the casserole. It should come out clean or with just a few moist crumbs, and the internal temperature should reach 160°F (71°C) to ensure the eggs are fully set.
   Look for The top is golden and puffed, the edges are caramelized, and the center is firm but tender.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If the center is still very wet, cook for 15 more minutes and check again.

After 2 1/2 hours on high, the casserole will have puffed up like a golden soufflé. The edges will be caramelized and buttery, and the center will be set but still moist. A knife inserted into the middle should come out clean, and the internal temperature should read 160°F (71°C). The aroma of butter and corn will fill your kitchen.

Serve and Savor

5. 5Serve Warm
   Turn off the slow cooker. Scoop the casserole onto a serving platter or directly onto plates. Top each portion with a pat of salted honey butter, letting it melt into the warm casserole before serving.
   Look for The casserole is spoon-tender, with a golden crust and soft, moist interior.
   Tip For clean squares, let the casserole rest for 5–10 minutes before cutting, though it is delicious straight from the crock.

Scoop the casserole onto plates or a platter while it is still warm. Top each serving with a pat of salted honey butter, which will melt into the golden surface. The texture should be spoon-tender, with a creamy interior and a slightly crisp top. This is the moment to enjoy the fruits of your slow cooker's labor.

Common mistakes

One common mistake is lifting the lid too often during cooking. Every time you open the slow cooker, heat escapes and cooking time increases.

Another pitfall is using undrained whole-kernel corn, which adds excess liquid and makes the casserole too soft. Finally, do not overcook—after 3 hours, the casserole can become dry and rubbery. Stick to the 2 1/2-hour mark and check from there.

How to tell it’s done

The casserole is done when it is puffed and golden on top, with the edges caramelized and slightly crisp. A knife or toothpick inserted into the center should come out clean or with just a few moist crumbs.

The internal temperature should reach 160°F (71°C) to ensure the eggs are fully set. If the center still looks wet, cook for an additional 15 minutes and check again. The casserole will be spoon-tender, not firm like a baked cornbread.

• Egg dishes: 160°F (71°C) in the thickest part