Roasted Vegetable "Quiche" (pareve, gluten free)

I have been trying to be more creative with my sug bet/cheap vegetable hauls, and one thing I've started making with them is pseudo-quiche. And it's a hit!

Today's dish started with kishuim (summer squash) and kohlrabi from the sug bet rack (2 shekels/kg) and onions - about 3 shekels/kg.

I'd actually already cooked the kishuim on Sunday - those were just sitting in my fridge waiting to be used up.

Here's what I did:

2 kohlrabi, peeled and chopped
1 onion, peeled and chopped
(other vegetables as desired)
1 tablespoon (approx) olive oil
1.5 cup already cooked kishuim
6 large eggs
1/4 cup potato starch
1.5 cups water
salt, pepper to taste

Lightly fry the onion and kohlrabi (and/or other veggies as desired) in the olive oil.
Transfer to a casserole dish.
Add the cooked kishuim (optional), and stir it all together.
Mix together potato starch and water, add eggs and seasonings, and whisk it all together. Pour egg mixture over vegetables.
Bake in a 200C oven for about 1 hr.

Serve warm or cold.

Enjoy!