Cheesy Stuffed Shells in a Cast Iron Skillet Step-by-step instructions

Before you start

Before you begin cooking, gather all of your ingredients and equipment to ensure a smooth process. Measure out the dry pasta shells, ground beef, shredded mozzarella, and seasoning. Chop the fresh parsley and set it aside for the final garnish.

Bring a large pot of salted water to a boil for the pasta, and ensure your cast iron skillet is clean and ready on the stovetop. Having everything prepped and within arm's reach prevents any step from burning or overcooking.

Instructions

Boiling Pasta and Browning Beef

1. 1Boil the Pasta Shells
   Bring a large pot of salted water to a boil. Cook the jumbo pasta shells according to the package directions until they are al dente, about 9 to 11 minutes. Drain the shells thoroughly in a colander and rinse with cool water to stop the cooking process, then set aside.
   Look for The shells should be pliable and cooked through but still firm enough to hold their shape without tearing.
   Tip Rinsing the shells with cold water prevents them from sticking together while you prepare the beef filling.
2. 2Brown and Season the Beef
   Heat a large cast iron skillet over medium-high heat. Add the ground beef and cook, breaking it up with a wooden spoon, until it is completely browned. Stir in the seasoning. Ensure the beef reaches a safe internal temperature of 160°F (71°C), then transfer the seasoned meat to a bowl and drain any excess grease.
   Look for The meat should be crumbly, fully browned with no pink remaining, and deeply aromatic.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Drain the cooked beef thoroughly to prevent the finished skillet dish from becoming greasy or watery.

At the end of this first phase, your jumbo pasta shells should be tender but still slightly firm to the touch, holding their shape perfectly without tearing. The ground beef in the skillet should be completely browned, crumbly, and deeply aromatic from the seasoning. There should be no pink meat remaining, and the savory scent of cooked beef and seasoning should fill your kitchen, signaling that the filling is ready.

Assembling and Stuffing the Shells

3. 3Assemble the Stuffed Shells
   Wipe the cast iron skillet clean. Spread one cup of the marinara sauce evenly over the bottom of the skillet. Carefully spoon the seasoned ground beef mixture into each cooked jumbo shell, packing it gently, and arrange the stuffed shells side-by-side in a single layer in the skillet.
   Look for The shells should be snugly nestled in the sauce, standing upright with the beef filling facing upward.
   Tip Use a small spoon or your fingers to gently open the shells and stuff them without tearing the pasta.

By the end of this assembly phase, your cast iron skillet will be beautifully arranged with the stuffed shells nestled tightly together in a single layer. The bottom of the skillet is coated in a rich layer of marinara sauce, and each shell is generously packed with the seasoned ground beef. The shells should look neat and uniform, prepared to absorb the flavors of the surrounding sauce during the final cook.

Melting Cheese and Final Simmer

4. 4Add Sauce and Melt the Cheese
   Pour the remaining marinara sauce over and around the stuffed shells in the skillet. Top the shells generously with the shredded mozzarella cheese. Cover the skillet with a lid or foil and simmer over medium-low heat for 15 minutes, or bake in a preheated oven at 375°F (190°C), until the sauce bubbles and the cheese is melted.
   Look for The sauce around the edges should bubble vigorously, and the mozzarella should be completely melted and gooey.
   Tip If baking, you can remove the cover for the last 3 minutes to get a slightly golden cheese crust.
5. 5Garnish and Serve
   Remove the skillet from the heat. Garnish the melted cheese layer with the chopped fresh parsley. Allow the stuffed shells to rest in the skillet for 5 minutes to let the cheese and sauce set slightly, then serve warm directly from the skillet.
   Look for The melted cheese should hold its shape slightly when sliced, yielding a dramatic, stretchy cheese pull.
   Tip Letting the skillet rest makes serving much easier and prevents the hot filling from falling out of the shells.

At the final checkpoint, the marinara sauce will be bubbling vigorously around the edges of the skillet, and the mozzarella cheese will be completely melted, gooey, and slightly golden.

When you lift a shell with a fork, it should yield a dramatic, stretchy cheese pull. The vibrant green parsley scattered over the top provides a beautiful contrast to the red sauce and white melted cheese, indicating the dish is ready to serve.

Common mistakes

One common mistake to avoid is overcooking the pasta shells during the initial boil. If the shells are boiled past the al dente stage, they will become too soft and tear easily when you attempt to stuff them with the ground beef.

Another frequent error is failing to drain the browned ground beef before stuffing the shells. Excess grease can make the filling soggy and cause the marinara sauce to split, resulting in an oily dish rather than a rich, cohesive skillet meal.

How to tell it’s done

To determine when the dish is perfectly cooked, check that the marinara sauce is hot and bubbling throughout the skillet, not just at the edges.

Since the ground beef is already fully cooked to a safe internal temperature of 160°F (71°C) in the first phase, the final cooking time is focused on melting the cheese and heating the assembled shells. The cheese should be completely melted and gooey, with a rich, uniform stretch when pulled.

• Ground meat: 160°F (71°C) in the thickest part