1) Get ready
Heat oven to 375°F. Lightly oil a 9 x 13-inch baking dish.
Mozzarella note: Reserve 1 cup mozzarella for the top. You will use the other 3 cups as 1 cup per layer in the middle.
If using regular noodles, cook in salted water until just shy of al dente, then drain and lay flat on a sheet pan or lightly oiled surface so they do not stick.
If using no-boil noodles, no prep needed. Just plan to keep them well covered with sauce as you layer.
2) Build the sauce
Heat olive oil in a large skillet over medium heat. Add onion and cook until softened, about 5 minutes. Add garlic and cook 30 seconds until fragrant.
Add ground beef and cook, breaking it up, until browned. Drain excess fat if needed. Season with salt, pepper, and Italian seasoning.
Stir in tomato paste and cook for 1 minute. Add marinara plus 1/2 cup water or broth (swish it in the jar to get every last bit). Simmer 5 to 8 minutes until slightly thickened. Taste and adjust seasoning. Jarred sauce salt levels vary, so trust your tongue.

3) Mix the ricotta layer
In a bowl, mix ricotta, Parmesan, parsley, and nutmeg (if using) until combined. Taste and add a pinch of salt if needed.
Stir in the egg last, just until incorporated. Once the egg is in, skip tasting and move on to layering.
4) Layer the lasagna
Spread about 1 cup sauce in the bottom of the baking dish.
- Layer 1: noodles (about 3)
- Spread 1/3 of the ricotta mixture over noodles
- Sprinkle 1 cup mozzarella
- Spoon about 1/3 of the remaining sauce over the top, keeping noodles well covered
- Repeat the noodle–ricotta–mozzarella–sauce sequence two more times
- Finish: final noodles (about 3), remaining sauce, and the reserved 1 cup mozzarella (plus extra Parmesan if you want)
No-boil tip: Make sure the top noodles are fully covered with sauce. If any corners are peeking out, tuck them under or spoon more sauce over them so they do not dry out.

5) Bake
Cover tightly with foil (tip: lightly oil the foil so cheese does not stick). Bake for 35 minutes.
Remove foil and bake 15 to 20 minutes more, until bubbly at the edges and the center is hot. If you want a more golden top, broil for 1 to 3 minutes, watching closely.
6) Rest, then slice
Let lasagna rest 20 to 30 minutes before cutting. This is the difference between clean slices and delicious chaos.
