01 -
Preheat oven to 190°C. Lightly grease a 33x23 cm baking dish with olive oil or cooking spray.
02 -
Bring a large pot of salted water to a boil. Add lasagna noodles and cook until al dente. Drain and set aside.
03 -
Heat olive oil in a large skillet over medium heat. Sauté the chopped onion for 3–4 minutes until translucent. Add minced garlic and cook for 1 more minute.
04 -
Add sliced mushrooms to the skillet with thyme, salt, and pepper. Cook until mushrooms are tender and liquid has evaporated.
05 -
Stir in chopped spinach leaves and cook for 2–3 minutes until wilted. Remove skillet from heat.
06 -
Spread a thin layer of marinara sauce on the bottom of the prepared dish. Arrange three lasagna noodles over the sauce.
07 -
Spread half of the ricotta cheese over noodles. Add half of the mushroom-spinach mixture. Sprinkle one-third of mozzarella and Parmesan over the vegetables.
08 -
Repeat layering with noodles, ricotta, remaining mushroom mixture, and another third of mozzarella and Parmesan. Top with final three noodles and remaining marinara sauce. Finish with the last portions of mozzarella and Parmesan.
09 -
Cover dish with aluminium foil and bake for 25 minutes in the preheated oven.
10 -
Remove foil and continue baking for 10–15 minutes until the cheese is golden and bubbling.
11 -
Let stand for several minutes before garnishing with fresh basil leaves. Slice and serve warm.