This 5-ingredient oven rigatoni is exactly the kind of weeknight magic I lean on when work runs late and I still want something cozy and homemade. You literally pour dry rigatoni straight into a casserole dish, add just four more everyday ingredients, and let the oven do all the work. No boiling pasta, no fancy techniques—just a bubbling, cheesy, saucy bake that tastes like you put in way more effort than you did. It’s inspired by those old-school Midwestern church potlucks where casseroles are king, but streamlined for busy schedules and minimal cleanup.
Serve this baked rigatoni with a simple green salad tossed in vinaigrette and some garlic bread or buttered toast to soak up the extra sauce. A side of roasted broccoli or green beans works really well if you want to add more veggies without extra fuss. If you’re hosting friends, pair it with a light red wine or sparkling water with lemon, and set out a small bowl of crushed red pepper flakes so everyone can spice their own portion just the way they like it.
5-Ingredient Oven RigatoniServings: 4
Ingredients
12 oz dry rigatoni pasta (uncooked)
3 cups jarred marinara sauce
2 1/2 cups water
1 1/2 cups shredded mozzarella cheese
1/4 cup grated Parmesan cheese
Directions
Preheat your oven to 375°F (190°C). Place an oval glass casserole dish (about 2 to 2.5-quart size) on the counter so it’s ready to go.
Pour the dry rigatoni straight into the casserole dish and spread it into an even layer. It should look like a snug bed of little tubes covering the bottom—that’s exactly what you want.
In a medium bowl or large measuring cup, whisk together the marinara sauce and water until evenly combined. This extra liquid is what lets the rigatoni cook through in the oven without boiling it first.
Pour the marinara mixture evenly over the dry rigatoni, gently shaking the dish so the liquid settles down between the pasta tubes. Press down lightly with the back of a spoon to make sure most of the pasta is submerged in the sauce.
Cover the casserole dish tightly with foil, making sure to crimp the edges well so steam can’t easily escape. This trapped steam is what will cook the raw rigatoni all the way through.
Bake, covered, for 35 to 40 minutes, until the pasta is mostly tender when you poke a piece with a fork and the sauce is bubbling around the edges.
Carefully remove the foil (watch out for hot steam). Sprinkle the shredded mozzarella evenly over the top, followed by the grated Parmesan.
Return the dish to the oven, uncovered, and bake for another 10 to 15 minutes, until the cheese is melted, bubbly, and lightly golden in spots.
Let the rigatoni rest on the counter for about 5 to 10 minutes before serving so it can thicken slightly and cool down just enough to eat comfortably.
Scoop into bowls and serve warm. If you like, you can finish each portion with an extra sprinkle of Parmesan or a pinch of red pepper flakes.
Variations & Tips
To add protein without changing the 5-ingredient base, you can stir in cooked Italian sausage, ground beef, or rotisserie chicken after the first bake, right before adding the cheese, then return it to the oven to heat through. For extra veggies, tuck a handful of baby spinach or a cup of frozen peas under the cheese layer; they’ll cook as the pasta finishes. If you prefer a creamier bake, swap 1/2 cup of the water for heavy cream or half-and-half. For a slightly smoky flavor, mix smoked mozzarella with the regular mozzarella. If your marinara is very thick, you may need an extra splash of water so the pasta stays mostly submerged; every oven runs a bit differently, so check a piece of rigatoni for doneness before pulling it out for good. Food safety tips: Always use an oven-safe glass casserole dish and avoid sudden temperature changes (don’t put a hot glass dish directly on a cold or wet surface) to prevent cracking. Handle the foil carefully when removing it, as the escaping steam can cause burns. Leftovers should be cooled, covered, and refrigerated within 2 hours and eaten within 3 to 4 days; reheat until hot and steaming in the center before serving.
