Preheat your oven to 400°F and line a baking sheet with parchment paper.
Arrange sliced zucchini and diced bell peppers on the sheet and roast for 15 minutes until tender and slightly charred.
Boil the chickpea lasagna noodles for 2 minutes less than the package instructions to maintain a firm texture.
In a food processor, pulse the firm tofu, nutritional yeast, lemon juice, sea salt, black pepper, and garlic powder until a velvety ricotta forms.
Wilt the fresh spinach in a small pan with a tablespoon of water over medium heat until just soft.
Spread a thin layer of marinara sauce in the bottom of a small baking dish to prevent sticking.
Layer the noodles, tofu ricotta, roasted vegetables, and wilted spinach, repeating the process until all ingredients are used.
Top with the remaining marinara and dried oregano, then bake at 375°F for 20 minutes until the sauce is bubbling and the flavors are melded.