This 3-ingredient oven retro mostaccioli casserole takes me right back to small-town church basements and Friday night potlucks, where the scent of bubbling pasta and cheese drifted down the hallway. It’s the kind of Midwest comfort food you put together in minutes, then let the oven do all the work while you enjoy a quiet evening or visit with family. No chopping, no fuss—just dry pasta, a good jar of sauce, and a generous blanket of cheese that bakes up into that old-fashioned, golden-brown crust we all remember from the 70s and 80s. It’s simple, sturdy, and exactly the kind of recipe you keep in your back pocket for busy days or lazy nights.
Serve this mostaccioli casserole straight from the oven in its baking dish, with a big spoon for scooping. A crisp green salad with a simple vinaigrette or ranch dressing balances the richness nicely, and a slice of buttered garlic toast or plain white bread is very much in the old Midwestern spirit. If you like, offer grated Parmesan at the table and a jar of red pepper flakes for anyone who wants a little heat. A glass of red wine or a tall glass of iced tea fits right in with this easy, comforting supper.
3-Ingredient Oven Mostaccioli CasseroleServings: 6
Ingredients
12 ounces dry mostaccioli pasta (uncooked)
3 cups jarred marinara or spaghetti sauce
3 cups shredded mozzarella cheese (low-moisture, part-skim, loosely packed)
Directions
Preheat your oven to 375°F (190°C). Lightly grease an oval ceramic baking dish (about 2 to 2 1/2 quarts) with a bit of oil or nonstick spray so the pasta releases easily and the edges can caramelize.
Pour the dry mostaccioli pasta evenly into the bottom of the baking dish. Spread it out so it forms a fairly even layer; this helps it cook uniformly in the oven without any stirring.
In a large measuring cup or bowl, whisk 3 cups of jarred marinara or spaghetti sauce with 1 cup of water until smooth and pourable. This extra liquid lets the dry pasta cook through in the oven without pre-boiling.
Pour the thinned sauce mixture evenly over the dry pasta, making sure all the noodles are moistened. Gently press down any pieces that are sticking up so they’re mostly submerged in the sauce; this keeps them from drying out while baking.
Cover the baking dish tightly with foil, crimping the edges so steam can’t easily escape. Place the covered dish on the middle rack of the preheated oven and bake for 35 to 40 minutes, until the pasta is mostly tender when you peek under the foil and test a piece.
Carefully remove the dish from the oven and take off the foil, watching for hot steam. Give the pasta and sauce a gentle stir, making sure any sauce pooled on top is mixed down so everything cooks evenly.
Sprinkle the shredded mozzarella evenly over the top of the hot pasta, covering the surface from edge to edge. Don’t pack the cheese down; leave it fluffy so it can bubble, brown, and form that old-fashioned, uneven golden crust.
Return the uncovered dish to the oven and bake for another 15 to 20 minutes, or until the cheese is fully melted, bubbling, and golden-brown in spots, with the edges a little caramelized. For extra browned, crispy peaks, you can move the dish under the broiler for 1 to 3 minutes at the end, watching closely so it doesn’t burn.
Remove the casserole from the oven and let it rest on the counter for about 10 minutes before serving. This short rest helps the sauce thicken slightly and keeps the cheese from sliding off when you scoop it. Serve hot, straight from the baking dish, with big spoonfuls that show off the saucy pasta under the bubbly cheese topping.
Variations & Tips
To keep this true to the spirit of a 3-ingredient, let-the-oven-work-for-you supper, stick with the basic trio: dry mostaccioli, jarred sauce, and mozzarella. That said, you can still adjust within those boundaries. For a richer, more old-school flavor, use a meat-based jarred spaghetti sauce instead of plain marinara. If you like a little bite, choose a spicy arrabbiata-style sauce. For a cheesier top, swap part of the mozzarella for provolone or an Italian blend, but keep the total amount around 3 cups so it still melts and browns properly. If your oven runs hot, start checking the cheese after 10 minutes of the uncovered bake so the top doesn’t over-darken. If your pasta seems a bit firm when you first uncover it, stir in a splash more water or sauce from the jar before adding the cheese, then finish baking. Food safety tips: Use pasteurized, store-bought cheese and sauce, and keep them refrigerated until you’re ready to assemble. Don’t leave the baked casserole at room temperature for more than 2 hours; refrigerate leftovers promptly, covered, and reheat thoroughly until steaming hot before serving again. If you broil at the end for extra browning, stay nearby and keep the door slightly ajar so you can pull the dish the moment the cheese turns deeply golden instead of burnt.
