The Ultimate Vegan Lasagna

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1. 1Step 1: Preheat oven to 400° F (200° C).
2. 2Step 2: In a large pot of salted boiling water, cook the lasagna noodles until al dente according to package directions (usually about 7 minutes). Drain and rinse with cool water to stop cooking. Drizzle with oil to prevent sticking and gently toss to coat.
3. 3Step 3: Heat oil in a large pan over medium heat. Once hot, add the onions and a sprinkle of salt. Sauté until softened and lightly golden, about 5-6 minutes.
4. 4Step 4: Add garlic, parsley, oregano, and crushed red pepper flakes, then sauté for 30-60 seconds until fragrant.
5. 5Step 5: Add mushrooms and cook until they have released their liquid, reduced in size, and are lightly golden (the pan should be almost dry), about 7-9 minutes.
6. 6Step 6: Add the spinach and a sprinkle of salt and pepper. Cook until the liquid is released and cooked off, and the spinach has reduced in size, about 5-6 minutes. Remove from heat. Taste for seasoning and add more if needed.
7. 7Step 7: Spread 1 cup of sauce evenly over the bottom of a 9x13 casserole dish.
8. 8Step 8: Add a single layer of lasagna noodles on top of the sauce (5 noodles), overlapping them slightly. Cut one noodle to fit width-wise.
9. 9Step 9: Spread half of the vegan ricotta over the noodles evenly with a spatula or the back of a spoon.
10. 10Step 10: Add half of the spinach and mushroom mixture in an even layer over the ricotta.
11. 11Step 11: Repeat the layers (starting with 1 cup of sauce) until all ingredients are used. The last layer of noodles will only have sauce on top. Optionally sprinkle with vegan parmesan cheese, or top with vegan mozzarella cheese.
12. 12Step 12: Cover loosely with foil and bake for 30-40 minutes, until heated throughout. Uncover and bake for 15 minutes to make it crispy and lightly browned on top. If you want a crispier top, turn on the broiler for 2-4 minutes, watching carefully to avoid burning.
13. 13Step 13: Let the lasagna rest for 15 minutes before cutting. Cut with a knife and remove with a spatula.