This twist on spaghetti pie from Katie Lee is perfect for feeding a group.
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Grease a 9 x 3-inch cake pan. Preheat oven to 350 degree F.
Bring a large pot of salted water to a boil. Add penne pasta and cook three to four minutes less than the package recommends, so that it is very al dente. Drain and reserve a small amount of pasta water.
In a large skillet over medium high heat, brown the beef. Season with salt and pepper. Transfer to a paper towel-lined plate to drain. Wipe the skillet clean with a paper towel. Heat olive oil in the skillet over medium heat and sauté onions until translucent, about four to five minutes. Remove from heat.
In a large bowl, whisk eggs, marinara, ricotta, ½ cup Parmesan, parsley, salt, pepper and two tablespoons reserved pasta water. Add cooked penne, beef and onions. Toss to evenly coat. Transfer to prepared cake pan. Top with mozzarella and sprinkle with remaining Parmesan.
Bake for 25 to 30 minutes, until cheese is bubbling and golden brown. Let sit 5 minutes, then cut into wedges and serve.