This Easy Spinach Stuffed Shells Recipe is the perfect pasta recipe for a busy weeknight! Made with simple ingredients, this dinner recipe is so good!

I learned how to make stuffed shells from my sister in law many many moons ago. I dare to say 10 years ago because I am pretty sure my husband and I weren’t even engaged then. I remember going to Virginia to visit her and my nephew and he introducing me to shells for the first time.

Like a great sister in law she showed me exactly how to make it, because honestly the whole notion of stuffed shells sounded like it was way beyond my culinary capabilities. I would learn that day that it was way easier than it seems and the end result looks phenomenal.

It’s really a matter of mixing different ingredients and stuffing (spooning) the mixture into the shells for baking. I have done stuffed shells with ground beef, cheese only, & ground turkey. 

What I loved the most about this recipe was that it was definitely mostly spinach. It pairs perfectly with a leafy spring salad and it is a rather quick meal, prep time for me was really no more than 20 minutes!

Ingredients

• 12 oz box jumbo shells pasta
• 10 oz bag frozen spinach
• 8 oz part-skim Ricotta cheese
• ¼ cup Parmesan-Reggiano cheese, grated
• 1 tsp salt
• 1 tsp black pepper
• 1 tsp garlic powder
• 1 Cup low moisture, part-skim, shredded mozzarella cheese
• 2½ cups Pasta Sauce

Ingredient Notes

Jumbo pasta shells (12 oz box): Cook them to just barely al dente — they’re going back in the oven for 15-20 minutes, so if you cook them all the way through before stuffing, they’ll be mushy by the time they’re done baking. Pull them at the shorter end of whatever the package says and taste one — it should still have a little resistance in the center. Drain and spread them on wax paper so they don’t stick together while you’re working.

Frozen spinach (10 oz bag): The most important step in this whole recipe is squeezing all the moisture out of the spinach after you cook it. All of it. Use a clean kitchen towel or a few layers of paper towels and really wring it out — if there’s excess water in the spinach, it goes into the filling, which goes into the shells, and you end up with a watery, soggy dish. This is the one step that determines whether the filling holds together properly or falls apart.

Part-skim ricotta (8 oz): This is the binding element for the filling. Don’t use fat-free — the texture is noticeably grainier and the filling won’t hold together as well. Part-skim gives you the right consistency without being as heavy as whole milk ricotta.

Parmigiano-Reggiano (¼ cup, grated): The sharper, saltier flavor of Parmesan adds depth to the filling that the mild ricotta alone doesn’t have. Grate it fresh if you can — pre-grated parmesan from the green can is a different product with a different texture and flavor.

Shredded mozzarella (1 cup): Goes on top of the filled shells before baking. It melts into the sauce and browns slightly on the edges during the bake — that’s the visual you want. One tablespoon is a typo in the original recipe; you need a full cup to get real coverage across the whole dish.

Pasta sauce (2½ cups): Any marinara you like works. Some goes on the bottom of the dish to prevent sticking; the rest goes on top of the filled shells before the mozzarella. Store-bought is fine — the spinach and cheese filling is where the flavor is, so the sauce is more background than star here.

Salt, pepper, garlic powder (1 tsp each): These season the filling. Taste the mixture before you stuff the shells and adjust — different brands of ricotta and parmesan vary in saltiness, so it’s worth checking before it goes in.

Instructions

How to Make It

Start by getting your oven to 350°F and a large pot of salted water boiling.

Add the jumbo shells to the boiling water and cook for 8-10 minutes — you want them just barely al dente, not fully cooked, since they’ll finish in the oven. Drain them and spread them out on a sheet of wax paper so they don’t stick to each other while you work. Drizzle a tiny bit of oil over them if they’re sticking.

While the shells are cooking, microwave the frozen spinach according to the package — usually about 5-6 minutes. Then drain it and squeeze out every bit of moisture you can. Use a kitchen towel or a handful of paper towels and really wring it out. This is the most important step in the recipe. Wet spinach = watery filling = soggy shells.

Once the spinach is dry, mix it in a bowl with the ricotta, parmesan, salt, pepper, and garlic powder. Stir until everything is evenly combined. Taste it and adjust the seasoning — this is your one chance before it goes into the shells.

Spoon a thin layer of pasta sauce into the bottom of a 9×13 casserole dish — just enough to cover the bottom so the shells don’t stick. Now stuff the shells. Use a regular spoon to pack the filling into each shell and place them face up in the dish. Don’t worry about it being perfect — just get the filling in there.

Once all the shells are in the dish, spoon the remaining pasta sauce over the top. Then sprinkle the full cup of shredded mozzarella evenly over everything.

Cover loosely with foil and bake for 15-20 minutes, until the cheese is melted and the sauce is bubbling at the edges. If you want the cheese to get a little golden on top, remove the foil for the last 5 minutes.

Serve hot. It pairs well with a leafy salad and some crusty bread, which is exactly how the sister-in-law who taught me this recipe served it the first time.

FAQs

Tips and Tricks

For perfect shells, always cook your pasta to al dente according to the package directions. Then rinse them under cold water to stop the cooking process. Make sure to drizzle a little oil on them to prevent sticking.

For the spinach, using fresh baby spinach is the way to go. Cook it over medium-high heat in a large skillet with a dash of olive oil, until wilted. Remember to squeeze out excess liquid using paper towels to avoid a soggy filling.

Variations

If you’re looking to switch things up, you could add some ground beef to the spinach mixture or replace the ricotta with cottage cheese or cream cheese for a different texture and taste.

For a healthier twist, substitute the regular pasta shells with whole grain jumbo shells.

Where to Serve

This dish is ideal for a family dinner, a potluck, or a dinner party. Pair it with a fresh salad and some crusty bread to create a wholesome meal.

Storage

These spinach stuffed shells store well. Cool the leftover shells to room temperature before placing them in a container with a tight-fitting lid. They can be stored in the refrigerator for up to 3 days.

Common Problems and How to Avoid Them

1. Soggy Pasta: To avoid soggy pasta, do not overcook the shells. Cook them just until al dente, then immediately cool them under cold water.
2. Dry Filling: To prevent a dry filling, make sure the spinach mixture isn’t too dry or too wet. Excess moisture should be removed but leaving a little will keep the filling moist and delicious.
3. Sticking Shells: Prevent the shells from sticking together by tossing them in a little oil after draining.

This recipe is a winner because it combines the comforting textures of pasta and cheese with the nutritional benefits of spinach. The creamy cheese mixture and the fresh spinach are encased in a shell, creating a delicious surprise with every bite.

What are some other fun pasta recipes to try?

If you are looking for more amazing delicious pasta recipes be sure to check out this comprehensive list –>  The Best Pasta Recipes For Weeknight Dinners!