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 Rotini Casserole?

You need 6 ingredients. The key ingredients include: 1 lb. box rotini noodles, cooked, 1 large onion, 1 large jar spaghetti sauce with mushrooms, 1 pkg. pepperoni, cut in half slices, and more.

Is Rotini Casserole suitable as general?

Yes, Rotini Casserole falls under the General category and is a great choice for this type of meal.

How do I store leftover Rotini Casserole?

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

Rotini Casserole Recipe

Name: Rotini Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1 lb. box rotini noodles, cooked; 1 large onion; 1 large jar spaghetti sauce with mushrooms; 1 pkg. pepperoni, cut in half slices; 1/2 stick butter; 1 (8 oz.) shredded Mozzarella cheese

Try this homemade Rotini Casserole recipe the whole family will love. Made with rotini noodles, onion, mushrooms and pepperoni. Easy step-by-step instru…

This Rotini Casserole relies on simple, everyday ingredients such as box rotini noodles, cooked, large onion and butter. It comes together quickly and makes 4 servings, at about 623 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 General

Servings: persons

1 lb. box rotini noodles, cooked
1 large onion
1 large jar spaghetti sauce with mushrooms
1 pkg. pepperoni, cut in half slices
1/2 stick butter
1 (8 oz.) shredded Mozzarella cheese

Frequently Asked Questions

Quick Info

Servings
4 servings
Calories
623 kcal
Category
General

Eats Now Editorial Team

Recipe developed & tested in-house

Passionate cooks who develop and test new recipes every day – from quick weeknight dinners to special occasion feasts.

Reviewed by the Eats Now Kitchen Team

More about our team →

Rotini Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

How did you like this recipe?

Frequently Asked Questions