Sift chickpea flour into a medium sized bowl.
Add nutritional yeast, basil, salt and pepper and whisk to thoroughly incorporate.
Add oil and water and whisk together. Set aside and let rest for a minimum of 30 minutes up to 2 hours.
While batter rests, slice squash and/or zucchini very thinly. A mandolin works very well for this, but do be very careful.
Preheat oven to 425 degrees and lightly grease a 9 in pie plate. Set aside.
Press squash between a tea towel or paper towels to remove excess moisture.
Arrange squash and zucchini in layers in prepared pie plate.
Pour batter over squash slowly, allowing it to fill in around the veggies and fully cover the squash.
Sprinkle cashew parmesan over the top. I used my herbed cashew parmesan.
Bake for 30-35 minutes until edges have browned a bit and the center is set and no longer liquid. Watch closely in the last few minutes to avoid over baking .
Allow to cool a few minutes before running a knife around edges and slicing. Serve immediately or allow to cool fully.