Slice zucchini and onion.

Cook zucchini and onion in a small amount of water for 3 minutes.

Drain the cooked vegetables.

Butter a casserole dish.

Place half of the cooked zucchini and onion mixture in the buttered casserole dish.

Mix grated Cheddar cheese and soda cracker crumbs in a bowl.

Pour half of the cheese mixture over the vegetables in the casserole dish.

Add the remaining zucchini and onion mixture.

Cover with the remaining cheese mixture.

Slightly beat the eggs.

Mix the beaten egg into the casserole.

Cover the casserole dish.

Bake at 350°F (175°C) for 20 minutes.