Preheat the oven to 350°F (175°C) and lightly grease a 13×9-inch baking pan.
In a large bowl, stir together the ricotta cheese, eggs, grated Parmesan, parsley, and 1 cup of the mozzarella until evenly combined.
Spread 1½ cups of spaghetti sauce across the bottom of the prepared pan.
Place four lasagna noodles over the sauce (most 13×9-inch pans fit three full noodles lengthwise and a broken piece across the width).
Spoon about one-third of the ricotta mixture over the noodles and gently spread it to cover.
Top the cheese layer with 1 cup of spaghetti sauce, then add another layer of noodles and repeat the cheese and sauce layers once more.
Finish with a final layer of sauce and sprinkle the remaining 1 cup of mozzarella evenly over the top.
Cover the pan with aluminum foil and bake for 45 minutes, then remove the foil and bake an additional 10 minutes until cheese is melted and bubbly.
Remove from the oven and let the lasagna stand for 10 minutes before slicing and serving.