Bring a large pot of salted water to a boil. Cook the shells for 1 minute less than indicated on the box. Drain and let cool. Spray a 9- by 13-inch casserole dish with nonstick spray.
Heat a large high-sided skillet over medium-high heat. Add the beef and sausage and cook until browned, while stirring and breaking up with the back of a wooden spoon, 3 to 4 minutes. Stir in the carrots and onions and cook until softened, about 4 minutes more. Stir in the garlic and red pepper flakes if using, and cook until fragrant, about 1 minute. Add the crushed tomatoes and simmer on medium-low, uncovered, for 20 minutes. Stir in the basil at the end.
Rinse the spinach in a colander with cold water. With water still clinging to the leaves, add the spinach to a large nonstick skillet over medium heat and toss with tongs until wilted. Remove from the heat and let cool. Once cool, wrap in paper towels and squeeze out any excess moisture. Chop roughly.
Preheat the oven to 350 degrees F.
In a large bowl, add the spinach, ricotta, 1/2 cup of the mozzarella, 1/4 cup of the Parmesan and the egg and give it a stir until well combined.
Spread 3 ladlefuls of sauce on the bottom of the prepared casserole dish. Stuff each shell with about 1 heaping tablespoon of spinach and cheese mixture. Place the shells in the dish and then cover with more sauce. Sprinkle the casserole with the remaining 1/4 cup Parmesan and remaining 1/2 cup mozzarella. Cover with foil and bake for 30 minutes. Remove the foil and keep baking until the cheese is melted and bubbly, another 5 minutes.

Kitchen-Friendly View

Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	481.15 Kcal (2014 kJ)
Calories from fat	216.81 Kcal
		% Daily Value*
Total Fat	24.09g	37%
Cholesterol	162.55mg	54%
Sodium	1038.65mg	43%
Potassium	657.84mg	14%
Total Carbs	21.38g	7%
Sugars	3.55g	14%
Dietary Fiber	1.94g	8%
Protein	43.93g	88%
Vitamin C	24.7mg	41%
Vitamin A	0.1mg	5%
Iron	7mg	39%
Calcium	745.1mg	75%

Amount Per 100 g
Calories	144.42 Kcal (605 kJ)
Calories from fat	65.08 Kcal
		% Daily Value*
Total Fat	7.23g	37%
Cholesterol	48.79mg	54%
Sodium	311.75mg	43%
Potassium	197.45mg	14%
Total Carbs	6.42g	7%
Sugars	1.07g	14%
Dietary Fiber	0.58g	8%
Protein	13.19g	88%
Vitamin C	7.4mg	41%
Iron	2.1mg	39%
Calcium	223.6mg	75%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

Search recipes
by ingredients

Construct & Analyze
Your Recipe

Analyze

Try this similar recipes

Gnocchi with White Beans

Olive oil, Onion, chopped, Garlic cloves, minced and 7 more..
Lentils with Sausage and Swiss Chard

Sweet italian turkey sausage (about 2 links), casings rem... and 9 more..
Lightened up Cottage Pie With Golden Mash for 2

Extra lean ground beef, Celery, finely chopped and 17 more..
Meat Sauce

Extra lean ground beef, Zucchini, Carrot, Onion, Garlic and 3 more..
Skinny Sloppy Joes

Lean ground beef, Steak seasoning or 1 tbsp seasoning salt and 9 more..
Fresh Marinara Sauce

Carrots, finely chopped, Onions, chopped and 8 more..
Lasagna Surprise

Chopped onion, Garlic cloves, minced, Vegetable oil and 8 more..
Zesty Ziti Bake

Ziti pasta or 1 lb rigatoni pasta, Vegetable oil and 12 more..
Calzone

Olive oil, Garlic cloves, crushed and 10 more..
Eggplant Lasagna

Eggplants, sliced in 1/4-inch slices, Olive oil and 8 more..
Roast Vegetable, Spinach and Ricotta Lasagna (Modified)

Eggplants or 1 butternut squash, cubed small and 30 more..
Feta and Herb Stuffed Shells

Olive oil, Onion, chopped, Garlic cloves, minced and 10 more..
Pasta Al Pomodoro

Extra-virgin olive oil, Onion, minced and 7 more..