Preheat oven to 375°F (190°C).
In a pan, heat olive oil. Sauté onion and garlic until soft, about 3 minutes.
Add chopped spinach and cook until wilted, about 2 minutes. Remove from heat.
In a blender, combine almond milk, cashew cream, nutritional yeast, basil, salt, pepper, and nutmeg. Blend until smooth.
In a greased baking dish, layer half the zucchini slices.
Spread the spinach-onion mix on top.
Pour half the cream sauce evenly over the layer.
Add the remaining zucchini slices.
Pour the rest of the sauce. Top with vegan cheese if desired.
Bake uncovered for 30 minutes until golden and bubbly.
Let it cool for 5 minutes. Serve warm and with an attitude.