Lasagna has a reputation as a weekend project, and the layering does take some time, but nothing about it is actually difficult — it's just assembly.
The one rule worth following closely: let it rest before cutting, or the first slice will collapse into a puddle of sauce.
Let the lasagna rest for a full 10-15 minutes after baking before cutting — this is what allows the layers to set and hold their shape instead of sliding apart on the plate.
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Brown the ground beef with onion and garlic, about 7 minutes. Drain fat, stir in marinara sauce, and simmer 10 minutes.
Cook lasagna noodles according to package directions until al dente. Drain and lay flat to prevent sticking.
Combine ricotta, egg, parsley, salt and pepper in a bowl.
Preheat oven to 375°F (190°C). In a 9x13-inch dish, layer meat sauce, noodles, ricotta mixture and mozzarella, repeating for 3 layers. Top with remaining mozzarella and parmesan.
Cover with foil and bake for 30 minutes, then uncover and bake 15-20 more minutes until bubbly and golden. Rest 10-15 minutes before slicing.
Cutting it too soon is the most common cause — lasagna needs 10-15 minutes to rest after baking so the layers set enough to hold together when sliced.
Regular lasagna noodles should be cooked to al dente first — oven-ready/no-boil noodles skip this step but need extra sauce moisture to soften properly while baking.
Yes — assemble fully, cover, and refrigerate up to 24 hours. Add about 10-15 extra minutes to the covered bake time if going in cold.