This oven baked 4-ingredient sheet pan spinach manicotti is a simple version of the classic my grandmother used to make, and it still hits the spot every time. She relied on just a few pantry staples and a big white casserole dish to turn pasta, ricotta, spinach, and sauce into a cozy, bubbling pan of comfort. This is the kind of recipe you pull out on a busy weeknight or a chilly Sunday when you want something warm, familiar, and family-friendly without a lot of fuss.
Serve this spinach manicotti hot, straight from the white casserole dish, with a simple green salad dressed in olive oil and vinegar, and some warm crusty bread or garlic toast to soak up the extra sauce. A side of roasted vegetables, like broccoli or green beans, works nicely if you want to round out the meal. For a cozy family dinner, I like to set the pan in the center of the table and let everyone scoop out their own cheesy manicotti while the mozzarella is still bubbling.
Oven Baked 4-Ingredient Sheet Pan Spinach ManicottiServings: 6
Ingredients
1 (8–10 ounce) box dry manicotti shells
1 (24–26 ounce) jar marinara pasta sauce
1 (15–16 ounce) container whole-milk ricotta cheese
1 (10 ounce) package frozen chopped spinach, thawed and well-drained
Directions
Preheat your oven to 375°F (190°C). Lightly grease a white 9x13-inch casserole dish or similar baking pan.
Bring a large pot of salted water to a boil. Add the manicotti shells and cook until just shy of al dente, usually 1–2 minutes less than the package directions. You want them firm enough to handle without tearing. Drain carefully and spread the shells out on a clean towel or baking sheet to cool slightly so they don’t stick together.
While the pasta cooks, prepare the spinach filling. Place the thawed chopped spinach in a clean kitchen towel or a few layers of paper towel and squeeze firmly over the sink to remove as much excess water as possible. This helps keep the filling thick and prevents watery sauce.
In a medium bowl, stir together the ricotta cheese and the well-drained spinach until evenly combined. Sprinkle with a pinch of salt and pepper if you like (optional, not counted as ingredients), and mix again. The mixture should be thick, creamy, and speckled with green spinach throughout.
Spread about 1 cup of the marinara sauce over the bottom of the greased casserole dish, just enough to lightly coat the surface. This keeps the manicotti from sticking and helps them cook evenly.
Fill the manicotti shells. Using a small spoon or a piping bag (you can also use a zip-top bag with the corner snipped off), gently stuff each shell with the spinach-ricotta mixture from both ends, filling all the way through. Place each filled shell in a single layer on top of the sauce in the casserole dish, nestling them close together.
Pour the remaining marinara sauce evenly over the filled manicotti, making sure all the shells are mostly covered. If the edges of a few shells peek through, that’s fine; those spots will get a little chewy and browned, just like Grandma’s did.
Cover the casserole dish tightly with foil. Bake in the preheated oven for 25–30 minutes, until the sauce is bubbling around the edges and the pasta is tender when pierced with a fork.
Carefully remove the foil and, if you like a slightly more set top, bake uncovered for an additional 5–10 minutes. The sauce should be bubbling, and the filling inside the manicotti will be hot and creamy. (If you happen to have a little extra ricotta mixture left, you can dot it on top before this final bake.)
Let the manicotti rest for about 5–10 minutes before serving so the filling can settle and it’s easier to scoop. Serve warm right from the white casserole dish, spooning some of the extra sauce over each portion.
Variations & Tips
To keep this close to the 4-ingredient classic my grandmother made, we stick to manicotti shells, marinara, ricotta, and spinach, but you can still make small tweaks without complicating things. For extra creaminess, stir a spoonful or two of grated Parmesan into the ricotta-spinach mixture if you don’t mind adding a fifth ingredient. If you have picky eaters who are unsure about visible greens, you can pulse the thawed spinach and ricotta together briefly in a food processor so the filling is smoother and the spinach blends in more. For kids who prefer less sauce, tuck their manicotti near one side of the pan and spoon a lighter layer of marinara over that section. If you want a bit of browned top without adding cheese, leave the dish uncovered for the last 10–15 minutes of baking so the exposed edges of the pasta get slightly crisp, the way many grandparents used to serve it.
Food safety tips: Always cook the manicotti shells according to package directions and handle them carefully to avoid tearing, which can expose filling and lead to uneven heating. Make sure the spinach is fully thawed and very well-drained; excess water can cool the casserole and cause it to bake unevenly. When baking, the center of the manicotti should be piping hot; if you have a food thermometer, aim for an internal temperature of at least 165°F (74°C) to ensure the filling is heated through safely. Refrigerate leftovers within 2 hours of baking, store them in an airtight container, and eat within 3–4 days. Reheat leftovers covered in the oven or microwave until steaming hot in the center before serving.
