Preheat your oven to 375°F.
Boil the jumbo pasta shells in a large pot of salted water until al dente, then drain and set aside to cool.
In a medium skillet over medium heat, brown the ground turkey with minced garlic and dried oregano until the meat is fully cooked.
Stir the marinara sauce into the skillet with the turkey and simmer on low for 5 minutes to meld the flavors.
Finely chop the fresh spinach and squeeze it firmly in a clean kitchen towel to remove all excess moisture.
In a medium mixing bowl, combine the cottage cheese, ricotta cheese, chopped spinach, sea salt, and black pepper until well incorporated.
Spread a thin layer of the turkey marinara sauce across the bottom of a small baking dish.
Fill each cooked pasta shell generously with the spinach and cheese mixture and place them into the baking dish.
Spoon the remaining turkey marinara sauce over the top of the stuffed shells.
Bake for 20 minutes until the sauce is bubbling and the filling is heated through.
Garnish with freshly chopped basil before serving warm.