This 4-ingredient oven chicken is the kind of dish I lean on when the day’s been long and the fridge looks a little bare. It starts with raw boneless skinless chicken thighs tossed right in a glass casserole dish—no marinating bowls, no fuss—then gets dressed with four simple fridge staples most Midwestern kitchens always seem to have on hand: mayonnaise, Dijon mustard, grated Parmesan, and a little splash of milk. It reminds me of the casseroles my mother used to pull together on busy farm nights, when flavor mattered more than fancy. The chicken bakes up tender and juicy under a golden, tangy-creamy topping that will have your family asking when you’re making it again.
This chicken is lovely with buttered egg noodles or mashed potatoes to catch all the extra sauce. Add a simple side of green beans, peas, or a tossed salad for color and crunch. Warm dinner rolls or a slice of crusty bread are perfect for mopping up the creamy juices from the casserole dish.
4-Ingredient Oven Chicken ThighsServings: 4
Ingredients
1 1/2 to 2 pounds raw boneless skinless chicken thighs (about 6–8 thighs)
1/2 cup mayonnaise
2 tablespoons Dijon mustard
1/4 cup grated Parmesan cheese
2 tablespoons milk (any kind, just enough to loosen the sauce)
Directions
Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch glass casserole dish, or give it a quick swipe with a bit of mayonnaise on a paper towel so the chicken doesn’t stick.
Lay the raw boneless skinless chicken thighs in a single layer in the glass casserole dish. If they’re folded up in the package, open them so they lie fairly flat. Pat them dry with a paper towel if they’re very wet so the topping clings better.
In a small bowl, stir together the mayonnaise, Dijon mustard, grated Parmesan cheese, and milk until you have a smooth, spoonable sauce. It should be thick but easy to spread; add another teaspoon of milk if it seems too stiff.
Spoon the sauce over the raw chicken thighs in the glass casserole dish. Use the back of the spoon to spread it so each piece is well coated on top and around the sides. It’s fine if some sauce slips down into the dish—that just makes a tasty little puddle as it bakes.
Slide the casserole dish into the preheated oven and bake, uncovered, for 30 to 40 minutes, until the chicken is cooked through and the topping is bubbling and lightly golden around the edges. The internal temperature in the thickest part of a thigh should reach at least 165°F (74°C).
If you’d like a deeper golden color on top, move the dish to the upper third of the oven for the last 5 minutes, or briefly switch to broil and watch very closely so the topping doesn’t burn.
Let the chicken rest in the glass casserole dish for 5 minutes after you take it out of the oven. Spoon some of the creamy juices from the bottom of the dish over the chicken when serving.
Variations & Tips
For a little extra zip, stir 1 teaspoon of prepared horseradish or a pinch of cayenne into the sauce. If you prefer a milder flavor, use yellow mustard in place of Dijon. You can also swap part of the mayonnaise for plain Greek yogurt or sour cream for a tangier, slightly lighter topping. A sprinkle of dried herbs—such as parsley, thyme, or Italian seasoning—over the sauced chicken before baking adds a nice country touch. If you like a bit of crunch, scatter a couple of tablespoons of dry breadcrumbs over the top for the last 10 minutes of baking. Food safety tips: Always start with fully thawed chicken; baking from frozen can cause uneven cooking. Keep raw chicken and its juices away from ready-to-eat foods, and wash your hands, utensils, and the counter thoroughly after handling it. Use a clean spoon each time you taste or adjust the sauce, and don’t put any sauce that has touched raw chicken back into the bowl. Bake until the chicken reaches 165°F (74°C) in the thickest part, and promptly refrigerate leftovers within 2 hours in a shallow container.
