Slice zucchini crosswise, 1/4-inch thick (approximately 7 cups).

Preheat oven to 350°F (175°C).

Grease a 9 x 13-inch baking dish.

In a large bowl, beat together eggs, milk, salt, baking powder, and flour until smooth.

Stir in parsley, garlic, onion, diced green chilies, shredded Jack cheese, and sliced zucchini.

Spoon the mixture into the prepared baking dish.

In a separate bowl, toss seasoned croutons in melted butter.

Sprinkle the buttered croutons evenly over the top of the casserole.

Bake uncovered in the preheated oven for 35 to 40 minutes, or until the center is set and the squash is tender.

Remove from oven and let stand for about 10 minutes before serving.