This oven baked 5-ingredient chicken alfredo bake is my best attempt at bottling up one of my grandmother’s no‑nonsense weeknight dinners. She never wrote a single thing down, so I stood in her tiny kitchen three different evenings, watching her measure with her hands, taste with her eyes closed, and pull this creamy, bubbling pan of comfort out of the oven. I finally figured out how she managed to turn a few simple ingredients into something that made everyone go quiet at the table for a minute. This version keeps her spirit—minimal fuss, pantry ingredients, and a cozy, family-style casserole that feels like a hug after a long day.
Serve this chicken alfredo bake straight from the glass 9x13 casserole dish with a big serving spoon so you get those long strands of fettuccine and golden bits of chicken in every scoop. It pairs nicely with a simple green salad dressed with lemon and olive oil, or some steamed broccoli that you can tuck right into the side of the plate for the kids. Garlic bread or warm dinner rolls are perfect for swiping up the extra sauce. For a relaxed family night, set the hot dish in the middle of the table, add some grated Parmesan and black pepper on the side, and let everyone help themselves.
Oven Baked 5-Ingredient Chicken Alfredo BakeServings: 6
Ingredients
12 oz dry fettuccine pasta
2 cups cooked chicken breast, bite-size pieces (about 8–10 oz cooked)
3 cups jarred Alfredo sauce (about two 15-oz jars)
2 cups shredded mozzarella cheese, divided
1/2 cup grated Parmesan cheese, divided
1/2 tsp kosher salt (or to taste, optional)
1/4 tsp black pepper (optional)
Nonstick cooking spray or a little butter for greasing the dish
Directions
Preheat your oven to 375°F (190°C). Lightly grease a 9x13 glass casserole dish with nonstick spray or a little butter. Set it on a baking sheet if you’re worried about bubbling over—my grandmother always did this to keep the oven clean.
Bring a large pot of salted water to a boil. Add the fettuccine and cook it 2 minutes less than the package directions for al dente. You want it still a bit firm since it will finish cooking in the oven. Drain the pasta well but do not rinse.
While the pasta cooks, make sure your chicken is cut into small, bite-size pieces. My grandmother always used leftover roasted or rotisserie chicken—whatever she had in the fridge—so this is a great way to use up extras.
In a large mixing bowl, combine the hot drained fettuccine, cooked chicken pieces, jarred Alfredo sauce, 1 1/2 cups of the shredded mozzarella, and 1/4 cup of the grated Parmesan. Sprinkle in the salt and pepper if using. Toss everything together with tongs or two big spoons until the pasta is well coated and the chicken and cheese are evenly distributed.
Taste a strand of pasta and a small piece of chicken (careful, it will be warm). If it needs more salt or pepper, add a little now and toss again. This is the step I watched my grandmother do every time—she trusted her taste more than any written recipe.
Pour the mixture into the prepared 9x13 glass casserole dish, spreading it out into an even layer. Use the back of a spoon to tuck any exposed pasta down into the sauce so it doesn’t dry out.
Sprinkle the remaining 1/2 cup mozzarella and remaining 1/4 cup Parmesan evenly over the top. Don’t worry if it’s not perfectly even—those little bare spots get deliciously toasty and browned.
Cover the dish loosely with foil, tenting it slightly so it doesn’t stick to the cheese. Bake in the preheated oven for 20 minutes, until the sauce is bubbling around the edges.
Remove the foil and continue baking for another 10–15 minutes, or until the top is lightly golden and the cheese is melted and starting to brown in spots. If your oven runs hot, start checking around the 8-minute mark after removing the foil.
Let the casserole rest on the counter for about 10 minutes before serving. This helps the sauce thicken slightly so the fettuccine lifts out in creamy ribbons instead of sliding all over the place.
To serve, bring the glass dish right to the table and use a large serving spoon to scoop out generous portions, making sure to dig down so you get plenty of chicken and sauce. It won’t look perfect—and that’s exactly how my grandmother liked it.
Variations & Tips
For picky eaters, you can keep the top cheese layer mild by using only mozzarella and skipping the Parmesan on top; serve extra Parmesan at the table for those who like a stronger flavor. If you want to sneak in vegetables, stir 1–2 cups of steamed broccoli florets or thawed frozen peas into the pasta mixture before baking—my kids barely notice when the veggies are coated in creamy sauce. For a little color and flavor without changing the ingredient list too much, you can use a garlic or roasted garlic Alfredo sauce from the store. If you prefer dark meat, leftover roasted chicken thighs work beautifully and stay very tender. To make ahead, assemble the casserole up through adding the cheese on top, cover tightly, and refrigerate up to 24 hours; when baking from cold, add 10–15 extra minutes covered, until the center is hot and bubbling. For food safety, always start with fully cooked chicken—never rely on the oven time here to cook raw meat. Leftovers should be cooled, then stored in a covered container in the refrigerator within 2 hours and eaten within 3–4 days; reheat until steaming hot all the way through. If reheating in the microwave, stir halfway so there are no cold spots. The sauce will thicken as it sits, so you can add a splash of milk or a spoonful of extra Alfredo sauce when reheating to bring back some creaminess.
