My aunt Helen made this every Sunday after church for 30 years straight. The secret is the sour cream layer.

This is my pared-down version of the Sunday casserole my Aunt Helen made after church for over 30 years. Every week, without fail, you’d walk into her farmhouse and smell that creamy chicken and broccoli bubbling away in the oven, with cheddar turning just a little bit golden on top. The secret was always the sour cream layer, tucked between the chicken and cheese so it melted into a rich, tangy sauce. With just four main ingredients and a hot oven, you get that same comforting Midwestern flavor with hardly any fuss—perfect for busy days when you still want something that feels like it came from Grandma’s table.

This chicken and broccoli bake is a meal in itself, but it really shines with a simple starch on the side—think buttered egg noodles, mashed potatoes, or a scoop of white rice to catch all that creamy sauce. A crisp green salad with a tangy vinaigrette balances the richness nicely, and a pan of warm dinner rolls or sliced crusty bread never goes to waste around this dish. For a classic Midwestern table, serve it family-style right from the casserole dish, with a bowl of applesauce or pickled beets to add a little sweet-and-sour note alongside.

Servings: 4

1 1/2 pounds boneless, skinless chicken breasts (about 3–4 small breasts), cut into bite-size pieces

Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch white ceramic casserole dish with butter or cooking spray so the creamy sauce doesn’t stick.

Pat the chicken pieces dry with paper towels so they brown a bit better and don’t water down the sauce. Season the chicken all over with about half of the salt and pepper.

Spread the seasoned chicken in an even layer across the bottom of the prepared casserole dish. It’s fine if the pieces touch; just try not to stack them too much so they cook evenly.

Scatter the broccoli florets evenly over the chicken, tucking some pieces down between the chicken so every bite gets a bit of vegetable. If the florets are large, cut them smaller so they turn tender in the oven.

In a medium bowl, stir together the sour cream, 1 cup of the shredded cheddar cheese, and the remaining salt and pepper until well combined. This is Aunt Helen’s “secret” sour cream layer that turns into a rich, tangy sauce as it bakes.

Dollop the sour cream and cheese mixture over the chicken and broccoli, then gently spread it with a spatula to cover everything in an even layer. Don’t worry if a few broccoli tips poke through; they’ll get nicely toasted.

Sprinkle the remaining 1 cup of shredded cheddar cheese evenly over the top. This will melt into a gooey, golden blanket as it bakes.

Cover the casserole dish loosely with foil, tenting it slightly so the cheese doesn’t stick. Bake covered for 20 minutes to let the chicken start cooking and the sour cream layer loosen into a sauce.

Remove the foil and continue baking, uncovered, for another 15–20 minutes, or until the chicken is cooked through (no pink in the center and juices run clear), the broccoli is tender, and the top is bubbling and lightly golden at the edges.

If you like a deeper golden top, you can place the casserole under the broiler for 1–3 minutes at the end, watching closely so the cheese doesn’t burn.

Let the casserole rest for 5–10 minutes before serving. This gives the creamy sauce a chance to thicken slightly so it clings to the chicken and broccoli. Serve straight from the dish with a big serving spoon, scooping down to get plenty of that sour cream layer in each portion.

To keep this true to its four-ingredient spirit, the main players are chicken, broccoli, sour cream, and cheddar; everything else is just to help them shine. You can swap boneless, skinless chicken thighs for the breasts if you prefer darker meat—they stay very tender and are a bit more forgiving if slightly overcooked. If you only have frozen broccoli, thaw it and pat it dry before adding so it doesn’t water down the sauce. For a little extra flavor without adding “real” ingredients, you can stir a pinch of garlic powder or onion powder into the sour cream layer, or sprinkle a bit of paprika over the top before baking. A handful of crushed buttery crackers or plain breadcrumbs over the cheese in the last 10 minutes of baking adds a nice crunch, much like the casseroles that showed up on every Midwestern church potluck table. For a lighter version, use light sour cream and reduced-fat cheddar, but know the sauce won’t be quite as rich or thick. Leftovers keep well in the refrigerator for up to 3 days; reheat covered in a 325°F (165°C) oven until hot in the center, or gently in the microwave. For food safety, make sure the chicken reaches an internal temperature of 165°F (74°C) before serving, and refrigerate any leftovers within 2 hours of baking. Avoid leaving the sour cream-based casserole out at room temperature for long periods, especially at summer gatherings; keep it hot on a warm setting or chilled until ready to reheat and serve.