01 -
Preheat the oven to 375°F (190°C).
02 -
Cook the pasta shells according to package instructions until al dente; drain and set aside.
03 -
In a skillet, brown the ground beef over medium heat; drain excess fat.
04 -
In a bowl, combine the cooked beef, ricotta cheese, 1/2 cup mozzarella cheese, Parmesan cheese, egg, Italian seasoning, salt, and pepper.
05 -
Stuff each pasta shell with the beef and cheese mixture.
06 -
Spread 1 cup of marinara sauce on the bottom of a baking dish.
07 -
Place the stuffed shells in the baking dish and cover with remaining marinara sauce. Sprinkle the remaining mozzarella cheese on top.
08 -
Cover with foil and bake for 25 minutes.
09 -
Remove the foil and bake for an additional 10 minutes until cheese is bubbly and golden.