01 -
Cook lasagna noodles according to package directions. Drain and set aside.
02 -
Heat olive oil in a large saucepan over medium heat. Add ground beef and break into small pieces. Cook until no longer pink, about 5 minutes. Add chopped onion, minced garlic, oregano, basil, salt, and pepper; sauté until onion is translucent, approximately 5 minutes. Stir in diced tomatoes and tomato sauce. Bring to a boil, then reduce heat and simmer uncovered for 30 minutes, stirring occasionally.
03 -
In a medium bowl, combine thawed, drained spinach with ricotta and shredded mozzarella cheese. Mix thoroughly and set aside.
04 -
Preheat the oven to 375 degrees Fahrenheit.
05 -
Spread a few ladles of meat sauce at the bottom of a baking dish. Lay out dried lasagna noodles. Spread 2 to 3 tablespoons of spinach-cheese filling evenly over each noodle, then top with 1 to 2 tablespoons of meat sauce. Roll each noodle tightly and place seam side down on the sauce in the baking dish. Repeat for all noodles.
06 -
Pour remaining meat sauce over the assembled roll-ups and sprinkle 2 cups of shredded mozzarella cheese evenly on top.
07 -
Cover the baking dish with aluminum foil and bake for 30 minutes. Remove foil and bake an additional 10 minutes until cheese is bubbly and golden.
08 -
Optionally garnish with fresh basil or parsley. Serve warm.