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 Spinach Cheese Casserole?

You need 10 ingredients. The key ingredients include: 9 oz. thin spaghetti or vermicelli, broken, cooked and drained, 1/2 c. butter, melted, 1/2 lb. fresh mushrooms, sliced, 1/4 c. diced onions, and more.

Is Spinach Cheese Casserole suitable as vegetarian?

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

How do I store leftover Spinach Cheese Casserole?

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

Spinach Cheese Casserole Recipe

Name: Spinach Cheese Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 9 oz. thin spaghetti or vermicelli, broken, cooked and drained; 1/2 c. butter, melted; 1/2 lb. fresh mushrooms, sliced; 1/4 c. diced onions; 2 (10 oz.) frozen chopped spinach, thawed and squeezed dry; 4 c. Monterey Jack cheese, shredded; 2 c. sour cream; 1/4 to 1/2 tsp. oregano; 1/4 tsp. salt; 1/4 tsp. pepper

Try this homemade Spinach Cheese Casserole recipe the whole family will love. Made with thin spaghetti, butter, fresh mushrooms and onions. Easy step-by…

This Spinach Cheese Casserole relies on simple, everyday ingredients such as butter, melted, fresh mushrooms, sliced, diced onions and sour cream. It comes together quickly and makes 4 servings, at about 1458 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

1458

kcal

Calories

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.
Coconut cream is a reliable plant-based alternative to dairy cream.

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

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Spinach Cheese Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

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