01 -
Turn on your oven to 375°F (190°C) and grease up a 9×13-inch pan with olive oil or a spritz of nonstick spray.
02 -
Heat up a pot of water with salt until it boils. Cook the noodles til they’re firm but tender, following the package guide. Drain them and put them aside.
03 -
Warm up olive oil in a big pan over medium heat. Toss in the onion and let it cook til soft, which takes about 3-4 minutes. Stir in garlic and cook another minute—when it smells amazing, it’s ready.
04 -
Add the mushrooms, thyme, and some salt and pepper to the pan. Cook them until they soften and any liquid they release disappears.
05 -
Mix in your chopped spinach with the mushroom mix. Let it cook down til the spinach wilts. This only takes a couple of minutes. Take it off the heat and set it aside.
06 -
Take some marinara and spread it thinly over the bottom of your greased dish. Lay down three noodles over the sauce.
07 -
Spread half the ricotta over your noodles. Add half the mushroom-spinach mix. Sprinkle on a third of the mozzarella and Parmesan.
08 -
Lay down another set of three noodles. Layer on the rest of the ricotta, the last of the mushroom-spinach mix, and another third of the cheeses.
09 -
Finish with the last three noodles, pour over the remaining marinara, and scatter on the rest of the cheese.
10 -
Cover the pan with foil and bake for 25 minutes. After that, uncover it and let it bake another 10-15 minutes until the cheese is melted and has a golden caramelized look.
11 -
Let the lasagna sit for about 10 minutes before slicing. Toss some basil on top as a finishing touch.