Caramelized Onion Egg Noodle Bake

If you’re looking for an easy oven baked caramelized onion egg noodle bake, this creamy 4-ingredient casserole recipe is the ultimate comfort food. Made with tender egg noodles, sweet caramelized onions, rich sour cream, and gooey mozzarella cheese, this simple baked noodle casserole delivers incredible flavor with minimal effort.

Perfect for busy weeknights, family dinners, holiday gatherings, or potlucks, this creamy egg noodle bake is a budget-friendly recipe that comes together with pantry staples. Every bite is rich, cheesy, and packed with the deep, sweet flavor of slow-cooked onions.

Why You’ll Love This Recipe

• Only 4 simple ingredients
• Rich, creamy, and cheesy comfort food
• Easy enough for busy weeknights
• Perfect for potlucks and family gatherings
• Budget-friendly pantry recipe
• Kid-friendly and vegetarian
• Great for meal prep and leftovers
• Customizable with chicken, ground beef, or vegetables

Ingredients

• 2 tablespoons salted butter
• 3 large yellow onions, thinly sliced
• 12 ounces wide egg noodles
• 2 cups full-fat sour cream
• 1½ cups shredded mozzarella cheese, divided

Instructions

1. Preheat the oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish.
2. Melt the butter in a large skillet over medium heat. Add the sliced onions and cook for 25–35 minutes, stirring occasionally, until deeply caramelized and golden brown.
3. Meanwhile, cook the egg noodles according to the package directions until just al dente. Drain well.
4. Combine the hot noodles with the sour cream and 1 cup mozzarella cheese, stirring until creamy.
5. Fold in the caramelized onions until evenly distributed.
6. Transfer the mixture to the prepared baking dish and sprinkle with the remaining ½ cup mozzarella.
7. Bake uncovered for 25–30 minutes, or until bubbly and lightly golden.
8. Let the casserole rest for 10 minutes before serving.

Recipe Benefits

• Caramelized onions add naturally sweet, rich flavor without extra ingredients.
• Egg noodles create a tender, comforting texture.
• Sour cream makes the casserole extra creamy and satisfying.
• Mozzarella cheese provides a perfectly gooey, golden topping.
• Minimal prep and only four main ingredients make this recipe ideal for busy schedules.

Tips & Variations

• Replace part of the sour cream with Greek yogurt for a lighter version.
• Swap mozzarella for Swiss, Monterey Jack, or mild cheddar.
• Add cooked shredded chicken or browned ground beef for extra protein.
• Stir in fresh parsley or chives before serving for extra freshness.
• Assemble up to 24 hours ahead and refrigerate until ready to bake.

Storage

Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the oven or microwave until hot throughout.