Preheat oven to 400 degrees. Cook pasta shells per package instruction, drain and set aside. Heat a large skillet over medium high heat, then add oil. Once oil is hot, add garlic and greens and sauté until just tender, about 2 minutes. Remove from heat and let greens cool.
Add ricotta, half the Parmesan, and half the mozzarella into a mixing bowl and combine with a rubber spatula. Add cooled greens and mix to combine. Add eggs, salt and pepper and mix to combine.
Place half of the jar of sauce on the bottom of a 9×11” casserole dish. Take roughly 2 Tbsp of cheese and greens blend mixture and stuff inside each shell, placing them open side up into baking dish.
Spread remaining sauce evenly over shells. Sprinkle with remaining mozzarella and Parmesan.
Cover with foil and bake for 20-30 minutes, or until noodles are tender and filling is set. Remove foil and bake for an additional 10 minutes, allowing cheese to melt and get slightly golden brown. Remove from oven and serve.