Pre-heat oven to 400F (200C), lightly oil an 8 x 6 inch baking dish.
In a medium/large pan, add the olive oil, garlic, purée, water, oregano, basil, and salt. Stir to combine, on medium heat cook until thickened (not too thick), approximately 15-20 minutes.
While sauce is cooking, cook the gnocchi in the boiling salted water, just until they float to the surface, approximately 30 seconds, drain immediately, do not rinse.
When sauce has thickened add the gnocchi and toss gently, place in the prepared baking pan, top with the shredded Mozzarella and then the grated Parmesan cheese. Bake for approximately 5 minutes then raise heat and broil for another 3-5 minutes or until cheese has browned, (watch it doesn't burn). Serve immediately. Enjoy!