Spread this 1 creamy topping onto raw chicken breasts into a glass casserole dish for a simple weeknight dinner that’s surprisingly filling

This creamy Swiss chicken bake leans on one simple, rich topping: a mixture of mayonnaise, sour cream, Parmesan, Swiss cheese, and garlic powder spread directly over raw chicken breasts in a glass casserole dish. It’s the kind of weeknight dish I turn to when I want something comforting and filling without fussing over multiple pans. The method is loosely inspired by classic Midwestern “mayo bakes” and church potluck casseroles, where a single creamy mixture does most of the work—keeping the chicken moist while creating a savory, golden crust on top.

Serve this creamy Swiss chicken with something that can soak up the extra sauce—steamed rice, buttered egg noodles, or mashed potatoes all work well. A simple green vegetable like roasted broccoli, sautéed green beans, or a crisp side salad with a tangy vinaigrette helps balance the richness. If you like, add a loaf of crusty bread to swipe through the cheesy pan juices, and a light, citrusy white wine or sparkling water with lemon to keep the meal feeling bright.

Servings: 4

4 boneless, skinless chicken breasts (about 2 pounds total)

Preheat your oven to 375°F (190°C). Lightly grease a glass 9x13-inch casserole dish with the olive oil, using your fingers or a paper towel to coat the bottom and sides.

Pat the chicken breasts dry with paper towels. Place them in the prepared glass casserole dish in a single layer, leaving a bit of space between each piece so the topping can settle around them.

Season both sides of the chicken breasts lightly with salt and pepper. Drizzle or rub any remaining olive oil over the tops of the chicken to help them stay moist under the topping.

In a medium mixing bowl, combine the mayonnaise, sour cream, shredded Swiss cheese, Parmesan cheese, garlic powder, 1/2 teaspoon kosher salt, 1/4 teaspoon black pepper, and the dried thyme or Italian seasoning if using. Stir until the mixture is completely smooth and the cheeses are evenly distributed. This is your single creamy topping.

Using a spatula or the back of a spoon, spread this 1 creamy topping evenly over the tops of the raw chicken breasts right in the glass casserole dish. Make sure each piece is fully covered from end to end; a slightly thicker layer on top will help keep the chicken juicy as it bakes.

Place the casserole dish on the center rack of the preheated oven. Bake for 25 to 35 minutes, depending on the thickness of your chicken breasts, until the chicken is cooked through and the topping is bubbling and lightly golden around the edges. The internal temperature of the thickest part of each breast should reach 165°F (74°C).

If you’d like a deeper golden top, switch the oven to broil for the last 2 to 3 minutes, watching closely so the creamy topping doesn’t scorch.

Remove the casserole dish from the oven and let the chicken rest for 5 to 10 minutes. This allows the juices to redistribute and the creamy topping to thicken slightly. Sprinkle with chopped fresh parsley, if desired, and serve the chicken with spoonfuls of the extra sauce from the bottom of the glass dish over each portion.

For a slightly lighter version, use light mayonnaise and light sour cream; the topping will be a bit looser but still satisfyingly creamy. If you prefer a sharper flavor, swap half of the Swiss cheese for shredded Gruyère or add an extra tablespoon of Parmesan. For a mushroom twist, scatter 1 to 1 1/2 cups of sliced fresh mushrooms around the chicken before spreading the topping; they’ll cook in the sauce and add an earthy note. You can also tuck a thin slice of Swiss cheese directly on each chicken breast before adding the creamy mixture for extra cheesiness. To make it more herb-forward, fold fresh chopped herbs like parsley, chives, or tarragon into the topping just before spreading. If your chicken breasts are very thick, consider slicing them horizontally into cutlets for more even cooking, or cover the dish loosely with foil for the first 15 minutes to help them cook through without over-browning the topping. Leftovers reheat well in a low oven (325°F/165°C) covered with foil; avoid the microwave if possible to keep the sauce from separating.