Mix the shredded chicken, cream of chicken soup, sour cream, Stone House Seasoning, poppy seeds, and shredded cheese together in a large bowl until well combined. Spread the chicken casserole mixture into a baking dish.
Add the crushed crackers and melted butter to a small mixing bowl. Stir until well combined. Spread evenly on top of the poppy seed chicken casserole.
Bake until the cracker topping begins to turn lightly golden brown and the internal temperature of the casserole is 165º F. Remove from the oven and allow to cool for a few minutes before serving.
Notes
Make Ahead and Storage Instructions:To make ahead. Make the casserole as directed and allow it to cool completely. Cover and store in the refrigerator for up to two days for the best flavor. To store. If you have leftovers, cool them completely and wrap them well or place them in an airtight container—put them in the refrigerator for up to four days.To freeze. Wrap the cooled casserole well in freezer-safe wrap and freeze for up to two months.To reheat. If frozen, thaw overnight in the refrigerator. Reheat in the oven, on the stovetop, or in the microwave. Be sure to heat the chicken to an internal temperature of 165 degrees before serving.