Place the butter, onion, and garlic in a small saucepan and saute over medium heat, until the onion is translucent.
1 tablespoon Salted Butter, 1 small Onion, 2 cloves Garlic
Grate the zucchini coarsely, place into a clean towel or muslin cloth and squeeze out as much liquid as you can.
2 large Zucchini
In a large bowl add the zucchini, onion mixture, spinach, cheddar cheese, half the feta cheese, almond flour, baking powder, salt, and pepper. Mix well.