This oven baked 3-ingredient chicken parmesan casserole is the kind of dish that makes the whole house smell like home. My grandma used to slide a glass baking dish just like this into the oven on busy weeknights, and it always stole the show at the table. The chicken turns out fork tender every time, tucked under a blanket of bubbling mozzarella and surrounded by a rich marinara that soaks up into every bite. With only three simple ingredients and no fussy steps, it’s the kind of practical, heartwarming recipe that fits right into a Midwestern kitchen—hearty, comforting, and made to share.
I like to serve this casserole spooned over buttered egg noodles or a bed of hot cooked spaghetti so the marinara can really shine. A simple green salad with a tangy vinaigrette helps balance the richness, and a side of garlic bread or warm dinner rolls is perfect for mopping up the extra sauce around the browned, cheesy edges of the dish. If you’re cooking for company, add steamed green beans or corn on the cob, and set the casserole right in the center of the table so everyone can dig in family style.
Oven Baked 3-Ingredient Chicken Parmesan CasseroleServings: 4-6
Ingredients
1.5 to 2 pounds boneless, skinless chicken breasts (about 3–4 medium pieces)
3 cups marinara sauce (homemade or store-bought)
2 cups shredded mozzarella cheese
Directions
Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch glass baking dish so the casserole doesn’t stick and the edges can brown nicely.
Lay the boneless, skinless chicken breasts in a single layer in the bottom of the glass baking dish. If any pieces are very thick, you can gently pound them or slice them in half lengthwise so they cook evenly and stay tender.
Pour the marinara sauce evenly over the chicken, making sure every piece is well coated and there are no dry spots. The chicken should be nestled in the sauce but not completely drowned—just a good, generous blanket.
Cover the baking dish tightly with foil and place it on the middle rack of the oven. Bake for 25–30 minutes, or until the chicken is mostly cooked through and just about fork tender when you test a piece with a fork.
Carefully remove the foil from the dish. Sprinkle the shredded mozzarella cheese evenly over the top of the saucy chicken, covering as much of the surface as you can so you get that nice melted layer with browned edges.
Return the uncovered dish to the oven and bake for another 15–20 minutes, or until the cheese is melted, bubbly, and starting to turn golden brown around the edges and the chicken is fully cooked through (165°F in the thickest part).
If you’d like deeper browning on top, switch the oven to broil for 1–3 minutes, watching closely so the cheese doesn’t burn—just let it get those toasty, caramelized spots like Grandma’s did.
Remove the casserole from the oven and let it rest for 5–10 minutes. This helps the sauce settle and keeps the chicken fork tender. Serve straight from the glass baking dish, spooning chicken, sauce, and melted mozzarella onto each plate.
Variations & Tips
If your family likes a little extra comfort, you can cut the chicken into bite-sized pieces before baking so it becomes more of a scoopable casserole—just keep an eye on the cook time, as smaller pieces may cook a bit faster. For a heartier meal, nestle the raw chicken right on top of a layer of cooked pasta in the baking dish before adding the marinara and cheese; the pasta will soak up the sauce as it bakes. If you prefer darker, crispier cheese, leave the casserole under the broiler for an extra minute or two, watching carefully. You can also split the dish into two smaller glass pans and freeze one (before baking) for another night—just thaw in the fridge and bake as directed. Adjust the marinara to your taste: a chunky, herbier sauce will give it more texture, while a smooth sauce makes it feel extra cozy and old-fashioned, like something you’d find on a small-town church supper table.
