Roast beef leftovers never tasted so good with this Leftover Pot Roast Pasta Casserole Recipe! Shredded leftover pot roast brings the casserole a rich and savory flavor, making it a hearty and satisfying dish.
Bring a large pot of salted water to a boil. Cook the pasta according to the package instructions until al dente.
While the pasta is cooking, heat a large skillet over medium heat, and saute the chopped onion and fresh thyme in olive oil until the onion becomes translucent.
Add the leftover pot roast and beef broth to the skillet and cook the meat until heated.
Drain the pasta and reserve 1/4 cup of the pasta water.
Add the cooked pasta, reserved pasta water, pot roast mixture, half of the Parmigiano cheese, gruyere cheese, nutmeg, and 1 1/2 cups of heavy cream to the pan. Mix well to ensure even distribution of ingredients.
Grease a 9x13 baking dish with butter. Transfer the pasta and pot roast mixture into the greased baking dish.
Pour the remaining 1/2 cup of heavy cream over the top of the mixture.
Sprinkle the shredded mozzarella cheese, breadcrumbs, and remaining Parmigiano evenly on top of the casserole.
Bake in the oven for about 20-25 minutes or until the top is golden and bubbly.
Once done, remove the pot roast casserole from the oven and let it rest for a few minutes before serving. If desired, sprinkle portions of the casserole with additional parsley.
Enjoy your delicious leftover pot roast casserole with pasta!
Notes
Cut or shred the leftover pot roast into bite-sized pieces so the beef distributes evenly throughout the casserole.
Cook the pasta just until al dente because it will continue cooking as the casserole bakes.
Don't skip the sauce because it helps keep the pasta and leftover beef moist while baking.