01 -
In a large frying pan over medium-high heat, cook the ground beef and diced onion, stirring occasionally and breaking up the meat, until the beef is browned and the onion is softened. Drain any excess fat if necessary, and lightly season the beef with salt and pepper.
02 -
Add both jars of spaghetti sauce to the cooked beef and onion mixture. Stir to combine and allow it to heat on medium-low for a few minutes to meld the flavors.
03 -
Spread 1 cup of the meat and sauce mixture evenly in the bottom of a 9x13 inch baking dish to prevent noodles from sticking and ensure moisture during baking.
04 -
Place 4 oven-ready lasagna noodles over the sauce. Spread half of the remaining meat and sauce mixture evenly over the noodles, and top with half of the shredded mozzarella cheese.
05 -
Add 4 more oven-ready lasagna noodles, top with the rest of the meat and sauce mixture, and finish with the remaining shredded mozzarella cheese, spreading it to the edges for even coverage.
06 -
Cover the lasagna tightly with foil and bake in a preheated 375°F (190°C) oven for 30 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is golden and bubbly.
07 -
Let the lasagna rest for 10 minutes before cutting into it to allow it to hold together when served.