Creating Easy Creamy Spinach Mushroom Lasagna can be straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Cook Noodles: Cook the lasagna noodles according to the package instructions until al dente. Drain and set aside.
3. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add diced onion and garlic, sautéing until translucent.
4. Add Mushrooms: Stir in sliced mushrooms and cook until they release moisture and become tender.
5. Incorporate Spinach: Add fresh spinach to the skillet, cooking until wilted. Season with salt, pepper, and nutmeg. Remove from heat and let cool slightly.
6. Prepare Cheese Mixture: In a medium bowl, combine ricotta cheese, Parmesan cheese, and a pinch of salt and pepper. Mix well.
7. Assemble Lasagna: In a large baking dish, spread a thin layer of béchamel sauce on the bottom. Layer 3 lasagna noodles over the sauce. Spread half the ricotta mixture over the noodles, followed by half the sautéed veggie mixture and a layer of mozzarella cheese. Repeat the layers, topping with the last 3 noodles.
8. Final Layer: Spread remaining béchamel sauce over the top layer of noodles and sprinkle with remaining mozzarella cheese.
9. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is golden and bubbly.
10. Cool and Serve: Once baked, remove from the oven and let it cool for about 10 minutes before slicing. Garnish with fresh basil leaves, if desired.

These steps will guide you in creating this incredible lasagna effortlessly.