Brown ground beef in a saucepan over medium heat, breaking it apart until no pink remains, about 5-7 minutes. Add diced onion, 1 tablespoon oregano, salt, and pepper. Cook until onion is translucent.
Stir in marinara sauce and water. Bring to a gentle boil, then remove from heat.
In a separate bowl, mix ricotta cheese, remaining oregano, eggs, Parmesan, and a pinch of salt and pepper until smooth.
In a 9x13 inch baking dish, spread a layer of meat sauce. Lay three noodles on top, followed by some ricotta mixture and a handful of mozzarella. Repeat layers until all noodles are used, finishing with ricotta and mozzarella on top.
Cover with foil and bake for about one hour. Remove foil and bake uncovered for an additional 10-15 minutes until cheese is golden and bubbly. Let rest for 15 minutes before slicing.
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Notes
Store leftovers in an airtight container in the fridge for 3-4 days. Reheat in the oven or microwave.