In a large skillet, add oil, butternut squash, garbanzo beans (chickpeas), and saute over medium heat for 6 minutes. Add salt, mushroom seasoning (or vegetable stock), thyme, pepper, water and simmer with lid for another 4 minutes, or until the butternut squash is soft.
Transfer into food processor. Add cashew or almond milk and blend until smooth.
Pre-heat oven to 400 °F (200 °C).
In a bowl, add all spinach filling ingredients together, mix well and set aside.
Grease bottom and sides of baking dish (9 ×13 inch) lightly with oil.
Add ⅓ butternut squash filling and spread on the bottom of baking dish.
Add lasagna sheets and spread half spinach filling on top.
Spread another layer (1/3) of butternut squash filling.
Add another layer of lasagna sheets and spread other half of spinach filling on top.
Layer again with lasagna sheets.
Spread the final layer (1/3) of butternut squash filling.
Sprinkle with panko, a pinch of salt and some thyme.
Cover the baking dish with foil and bake for 30 min.
Remove foil and bake additional 10 minutes.