1. Cook the pasta shells in large pot, so that they dont stick to each other.
2. Cook only for about 10 min till slightly soft since it would cook more in the oven. Drain.
3. In a skillet, cook the onions and garlic in 1 tsp of olive oil and then add the marinara sauce.
4. Add seasoning and the salt/pepper if needed. bring to a boil.
5. Mix the 4 cheeses along with cilantro/parsley.
6. Spray non stick oil spray in a shallow baking pan and ladle some of the sauce at the bottom.
7. Now pipe the cheese mixture into the jumbo shells one by one and place in the pan.
8. Once done, pour rest of the marinara on top.
9. Bake at 350F for about 15-20 min and serve hot.

Courtesy: http://chefinyou.com/