This 5-ingredient oven casserole leans into the practical spirit of mid-century party cooking: simple pantry items, minimal prep, and a bubbling baked dish that feels hearty enough for supper yet easy enough for a weeknight. The classic 1950s Tupperware-era approach was all about convenience and dependable results, and this version follows that same path with a concealed baked protein tucked under a creamy, crisp-topped layer that turns deeply golden in the oven.
Serve this casserole with a crisp green salad, buttered green beans, sliced summer tomatoes, or simple fruit for a balanced plate. Because the casserole is rich and savory, lighter sides work especially well, and a basket of warm rolls or buttered toast is useful for scooping up the creamy edges from the baking dish.
5-Ingredient Oven 1950s Tupperware Party Casserole
Servings: 6
Ingredients
2 pounds boneless skinless chicken thighs
1 can (10.5 ounces) condensed cream of mushroom soup
1 cup sour cream
1 sleeve buttery round crackers, crushed
4 tablespoons unsalted butter, melted
Directions
1. Heat the oven to 375°F and lightly butter or grease a deep 9-by-13-inch baking dish.
2. Arrange the chicken thighs in an even layer in the prepared baking dish.
3. In a medium bowl, stir together the condensed cream of mushroom soup and sour cream until smooth, then spread the mixture evenly over the chicken so the protein is fully concealed.
4. Toss the crushed crackers with the melted butter until coated, then scatter the crumbs evenly across the top of the casserole.
5. Bake uncovered for 45 to 55 minutes, until the topping is deeply golden, the filling is bubbling around the edges, and the chicken is cooked through. Let rest for 10 minutes before serving.
Variations & Tips
Use turkey instead: Leftover roasted turkey works well here if you want an even more retro, make-do style casserole. Because the turkey is already cooked, reduce the baking time slightly and bake just until the filling is hot and the top is browned.
Swap the soup flavor: Cream of chicken or cream of celery can stand in for cream of mushroom if that is what you have on hand. Each one shifts the flavor a bit, but the method stays exactly the same.
Add a little seasoning: If you do not mind moving beyond the strict 5-ingredient idea, a little black pepper, onion powder, or poultry seasoning in the sour cream mixture gives the casserole more depth without changing its easy character.
Keep the crust crisp: Letting the casserole rest before serving helps the creamy base settle and keeps the buttery crumb topping from sliding off. If the top browns too quickly in the oven, tent it loosely with foil for the remainder of the baking time.