French Onion Leftover Beef Noodle Bake with Mozzarella
Transform leftover pot roast into this comforting casserole that combines tender beef with egg noodles in a savory French onion-inspired broth. The dish features caramelized flavors from thyme and Worcestershire sauce, topped with melted mozzarella for a golden finish. Perfect for busy weeknight dinners when you want to repurpose leftovers into something special. The crimini mushrooms add earthiness while the beef broth creates a rich, satisfying base that brings everything together.
Ingredients
- 16 ounces egg noodles
- 2 cups leftover pot roast, chopped
- 1 teaspoon kosher salt
- ½ teaspoon coarse ground black pepper
- 1 yellow onion, thinly sliced
- 2 teaspoons dried thyme
- 4 cups beef broth
- 2 tablespoons Worcestershire sauce
- 2 cups crimini mushrooms, slicedbutton mushrooms1:1basic
slightly milder flavor
- 2 cups Mozzarella cheese, shredded
Instructions
- 1
Preheat oven to 375 degrees
- 2
Add egg noodles to boiling water and cook 2 minutes shy of package instructions then drain and set aside
- 3
Add leftover pot roast, salt, pepper, onions, thyme, beef broth and Worcestershire sauce to pot
- 4
Bring to a boil on medium heat and cook for 15 minutes until meat is tender and falling apart
- 5
Combine egg noodles, mushrooms and beef mixture in large bowl
- 6
Top with mozzarella cheese and bake for 20 minutes until top is golden brown
Tips
Cook noodles slightly underdone since they'll finish cooking in the oven and absorb more flavor from the beef mixture.
Let the beef mixture simmer the full 15 minutes to ensure the flavors meld and the meat becomes fork-tender.
Use freshly shredded mozzarella for better melting and browning compared to pre-shredded cheese.
Good to Know
Refrigerate covered for up to 3 days. Reheat in 350F oven until heated through.
Assemble casserole without cheese up to 1 day ahead. Add cheese and bake when ready to serve.
Serve hot directly from baking dish with crusty bread or simple green salad.
Common Mistakes
Cook noodles al dente to avoid mushy texture after baking.
Don't skip the simmering step or beef won't be tender enough.
Cover with foil if cheese browns too quickly before casserole is heated through.
Substitutions
Gluten-Free Swaps
General Alternatives
FAQ
Can I use fresh mushrooms instead of crimini?
Yes, button or baby bella mushrooms work well. Slice them similarly and they'll cook perfectly in the oven with the other ingredients.
What if I don't have leftover pot roast?
Use any leftover cooked beef like roast beef or steak, chopped into bite-sized pieces. Cook it briefly in the broth to warm through.
How long will this keep in the refrigerator?
Store covered for up to 3 days. Reheat individual portions in microwave or whole dish in 350F oven until heated through.