Step 1

Preheat oven to 350°F. Grease a 2-quart baking dish and set aside. In a large skillet, melt the butter over medium heat. Sprinkle with flour and whisk constantly for 1 minute. Add the celery salt and kosher salt; whisk to combine. Slowly add the milk, whisking constantly, until combined. Bring the sauce to a simmer and cook, whisking constantly, for 1 minute. Remove from the heat.

Step 2

Add the chicken and the corn to the sauce; stir to combine. If the sauce seems too thick, just add a little bit of extra milk until it reaches the desired consistency. This is also a great time to taste the mixture and season with any additional herbs or spices that you might enjoy.

Step 3

Transfer the mixture to the prepared baking dish. Sprinkle the buttered cracker crumbs over top.

Step 4

Bake, uncovered, until hot and bubbly on the inside and browned on top, about 25-30 minutes.