01 -
Turn on your oven to 400°F (205°C) and lightly grease a casserole dish (9x13).
02 -
Warm olive oil on medium heat in a pan. Toss in the spinach, zucchini pieces, and yellow squash cubes. Stir until the spinach shrinks and the squash gets soft. Pour off any extra liquid.
03 -
Grab a big bowl and mix the cooked squash and spinach with the feta, parmesan, breadcrumbs, egg whites, salt, garlic powder, black pepper, and basil. Stir till it’s evenly blended.
04 -
Evenly spread the mixture into the dish you prepared earlier.
05 -
Put the dish into the oven and bake for 30-40 minutes, or until the top turns golden and crispy.
06 -
Let it rest a bit before you serve it up.