In large, warm saucepan, put 1 tablespoon oil, the shole garlic clove, and washed spinach. Cover and cook 4 minutes, wilting the spinach leaves.
Remove garlic and drain spinach. Heat over to 350 degrees.
Reheat pot; add 1 1/2 tablespoons oil, chopped garlic, onion, basil, and zucchini. Cook until onion is soft. Mix in spinach.
Oil baking dish. Spread spinach-zucchini mixture over bottom of dish. Pour egg over vegetables, tilting to evenly distribute the mixture. Sprinkle with crumbs.