How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Potato Zucchini Casserole?

You need 12 ingredients. The key ingredients include: 2 Tbsp. butter or oleo, 2 medium zucchini (1/2 lb.), 1/4 c. minced onion, 1 pkg. scalloped potato mix, and more.

Is Potato Zucchini Casserole suitable as vegetarian?

Yes, Potato Zucchini Casserole falls under the Vegetarian category and is a great choice for this type of meal.

How do I store leftover Potato Zucchini Casserole?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Potato Zucchini Casserole Recipe

Name: Potato Zucchini Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2 Tbsp. butter or oleo; 2 medium zucchini (1/2 lb.); 1/4 c. minced onion; 1 pkg. scalloped potato mix; 2/3 c. milk; 1/2 tsp. dried thyme; 1 1/2 c. Cheddar cheese; 1 large tomato; 1/2 lb. mushrooms, sliced or 1 can; 2 c. hot water; 3 Tbsp. chopped parsley; 1/2 tsp. dried marjoram

Try this homemade Potato Zucchini Casserole recipe the whole family will love. Made with butter, zucchini, onion and potato mix. Easy step-by-step instr…

This Potato Zucchini Casserole relies on simple, everyday ingredients such as butter or oleo, medium zucchini (1/2 lb.), minced onion and scalloped potato mix. It comes together quickly and makes 4 servings, at about 509 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Vegetarian

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

Saved locally in your browser — visible only to you.

Potato Zucchini Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

How did you like this recipe?

Frequently Asked Questions