Chicken and Broccoli Lasagna!

If you love rich comfort food but are looking for a break from traditional red-sauce baked ziti or marinara pasta, this Chicken and Broccoli White Lasagna is the ultimate weeknight-to-weekend upgrade.

Think of it as the ultimate mashup between a silky, restaurant-quality Fettuccine Alfredo, a cozy chicken divan, and a towering, multi-layered Italian-American baked pasta. You get tender, ruffled pasta ribbons sandwiching juicy pulled chicken, tender-crisp bright green broccoli, and sweet sautéed onions, all bound together by a velvety homemade garlic-parmesan sauce and capped with a bubbly blanket of golden, blistered mozzarella.

The best part? Unlike traditional lasagna—which often demands hours of slow-simmering meat sauce and delicate ricotta custard prep—this white sauce version comes together easily and bakes into neat, sliceable squares that hold their shape on a plate without collapsing into a watery mess.

The Science: Why White Lasagnas Get Watery (And How to Avoid It)

If you have ever made a vegetable or chicken pasta bake that came out of the oven floating in a soupy, separated puddle, the culprit is almost always unmanaged vegetable moisture and a broken sauce emulsion. Here is how we build it right:

1. The Broccoli Blanch & Pat-Dry: Broccoli florets act like little sponges. If you drop raw broccoli directly into the lasagna, it releases steam and intracellular water as it bakes, watering down the béchamel sauce into a thin broth. Blanching the florets in boiling water for just 2 minutes par-cooks them so they stay sweet and vibrant green, and blotting them dry on a kitchen towel removes the excess surface moisture before assembly.
2. The Hybrid Béchamel-Velouté Base: A standard béchamel is made solely with butter, flour, and milk. While rich, it can sometimes taste one-dimensional in a large casserole. By using equal parts rich whole milk and savory chicken broth with our butter-flour roux, we create a hybrid sauce. The chicken broth introduces savory glutamates and umami that amplify the shredded chicken, while the milk fat stabilizes the freshly melted parmesan cheese without curdling.
3. The 20-Minute Counter Rest: When hot dairy sauces and melted mozzarella come screaming out of a 375°F (190°C) oven, the fats and starches are completely fluid. If you cut into the pan immediately, the layers will slide apart. Giving the casserole 15 to 20 minutes on the counter allows the starch network in the pasta and béchamel to cool and set, giving you neat, bakery-style squares when lifted with a spatula.

Ingredients & Exact Proportions

For the Pasta & Foundation:

• 9 oz lasagna noodles (about 9 to 12 long sheets; use standard boil noodles or high-quality oven-ready sheets)
• 1 tbsp olive oil (for coating par-boiled noodles and cooking the aromatics)

For the Savory Chicken & Broccoli Filling:

• 2 ½ lbs cooked chicken, shredded (store-bought rotisserie chicken works wonderfully, or poached chicken breasts/thighs)
• 16 oz fresh broccoli florets, chopped into small, bite-sized pieces (about 4 cups)
• 1 medium yellow onion, finely diced
• 2 garlic cloves, finely minced
• 1 tbsp dried Italian herb blend (dried oregano, basil, thyme, and rosemary)
• 1 teaspoon kosher salt, plus more to taste
• ½ teaspoon freshly cracked black pepper

For the Garlic Parmesan Cream Sauce:

• 4 tbsp (½ stick / 55 g) unsalted butter
• 4 tbsp all-purpose flour
• 1 cup low-sodium chicken broth
• 1 ½ cups whole milk, warmed slightly (so it blends smoothly into the roux)
• 1 cup freshly grated Parmesan cheese (Parmigiano-Reggiano, grated fine)
• ⅛ teaspoon ground nutmeg (optional, but adds a warm, nutty aroma to white sauces)

For the Cheesy Top & Garnish:

• 2 cups shredded whole-milk mozzarella cheese (low-moisture blocks shredded by hand melt best)
• 2 tablespoons fresh flat-leaf parsley, finely chopped for a pop of color

Step-by-Step Master Execution

1. Cook the Pasta

1. Bring a large 6-quart pot of water to a rolling boil and season generously with salt (it should taste lightly of the sea).
2. Drop in the 9 oz lasagna noodles and cook until al dente—about 1 to 2 minutes less than the package directions. (The noodles will continue softening inside the sauce as the casserole bakes in the oven).
3. Drain the noodles and rinse briefly under cold tap water to stop the cooking. Lay the noodles flat on a rimmed baking sheet lined with a light rub of olive oil or parchment paper so they don’t stick or tear.

2. Blanch the Broccoli

1. Using the same pot of boiling water (or a small saucepan of simmering water), drop in the 16 oz of chopped bite-sized broccoli florets.
2. Blanch for exactly 2 minutes until tender-crisp and bright emerald green.
3. Immediately drain in a colander and spread the florets out over a clean kitchen towel or paper towels. Gently press with another paper towel to absorb as much surface water as possible.

3. Sauté the Aromatics & Combine Filling

1. In a medium skillet set over medium heat, warm the 1 tbsp olive oil.
2. Add the finely diced yellow onion and cook for 4 to 5 minutes until soft, sweet, and translucent.
3. Add the 2 minced garlic cloves and 1 tbsp dried Italian herbs. Sauté for 60 seconds, stirring constantly until the garlic turns fragrant and golden.
4. Remove the skillet from the heat. In a large mixing bowl, toss together the shredded chicken, the blotted broccoli florets, and the sautéed onion and garlic mixture. Season with ½ teaspoon salt and black pepper; mix until well combined.

4. Whisk Up the Garlic Parmesan Sauce

1. Place a medium saucepan or deep saucier over medium heat and melt the 4 tbsp butter.
2. Once bubbling, sprinkle in the 4 tbsp all-purpose flour. Whisk continuously for 1 to 2 minutes until the flour turns a light straw color and loses its raw, pasty aroma.
3. Slowly pour in the 1 cup chicken broth in a thin, steady stream while whisking rapidly to keep the roux smooth and lump-free.
4. Whisk in the 1 ½ cups warm whole milk.
5. Continue whisking gently as the liquid comes up to a soft simmer. Let it cook for 3 to 4 minutes until it visibly thickens into a glossy sauce that coats the back of a spoon.
6. Pull the pan off the heat entirely. Whisk in the 1 cup finely grated Parmesan cheese, ½ teaspoon salt, black pepper, and a pinch of ground nutmeg until the cheese melts into a silky, savory cream. Taste and adjust seasoning as needed.

5. Assemble the Tiers

1. Preheat your oven to 375°F (190°C). Lightly mist a standard 9×13-inch deep casserole dish with cooking spray or brush with a little olive oil.
2. The Base Coat: Ladle roughly ½ cup of the warm parmesan cream sauce over the floor of the dish and spread it thin with a spoon. (This lubricates the bottom noodles and prevents them from drying out or sticking to the pan).
3. Layer 1: Lay 3 or 4 lasagna noodles across the bottom, overlapping their ruffled edges slightly.
4. Filling: Scatter half of the chicken and broccoli mixture evenly over the noodles. Ladle about one-third of the remaining sauce over the meat and vegetables, then scatter ½ cup shredded mozzarellaover top.
5. Layer 2: Place a second tier of lasagna noodles on top. Distribute the remaining chicken and broccoli mixture, spoon over another third of the sauce, and sprinkle with ½ cup shredded mozzarella.
6. The Crown: Top with the final layer of noodles. Pour all the remaining parmesan cream sauce over the top, making sure to spread it all the way to the outer corners so no pasta edges dry out. Shower the top with the remaining 1 cup shredded mozzarella.

6. Bake to Bubbly Perfection

1. Tear off a sheet of aluminum foil and lightly mist the shiny side with non-stick spray (this prevents the melted mozzarella from sticking to the foil as it bakes). Cover the dish tightly.
2. Bake covered at 375°F (190°C) for 25 minutes to heat the interior through and melt the layers together.
3. Carefully remove the foil. Return the lasagna to the oven uncovered for 15 to 20 minutes, or until the top is bubbling vigorously and the cheese is golden and caramelized around the edges.
4. (Optional Golden Crust Trick: Switch your oven to BROIL on HIGH for the final 2 minutes, watching like a hawk until deep mahogany blister marks appear on the cheese).

7. The Crucial Rest & Slice

1. Pull the pan out of the oven and place it on a heatproof cooling rack.
2. Let the lasagna rest undisturbed for 15 to 20 minutes. As it rests, you’ll see the bubbling calm down and the sauce settle into the pasta layers.
3. Scatter the 2 tablespoons chopped fresh parsley over the top.
4. Using a sharp chef’s knife or clean bench scraper, slice into generous squares and serve with a sturdy metal spatula.

Home Cook Tips & Quality Hacks

• Shortcut with Rotisserie Chicken: A standard grocery store rotisserie chicken yields almost the exact 2 ½ to 3 cups of shredded breast and dark meat you need. Plus, the roasted seasoning on the chicken skin adds immediate savory flavor to the filling.
• No-Boil Noodles Hack: If using “oven-ready” or no-boil lasagna sheets, you don’t need to par-boil them in a pot! Simply soak them in warm tap water in a shallow dish for 10 minutes while you make the sauce to soften them slightly, then assemble and bake covered for 30 minutes before removing the foil.
• Make-Ahead & Freezer Method:
  • Refrigerating: Assemble the entire lasagna up to 24 hours in advance, cover tightly with foil, and chill in the fridge. When ready to bake, pull it out 20 minutes before heating and add 10 to 15 extra minutes to the covered bake time.
  • Freezing: You can freeze the fully assembled, unbaked casserole (wrapped tightly in plastic wrap and heavy aluminum foil) for up to 2 months. Thaw overnight in the refrigerator before baking as directed.
• Leftovers: Keep leftovers in an airtight container in the fridge for up to 4 days. Reheat individual slices in the microwave with a tiny splash of milk over top to keep the cream sauce luscious, or warm in a 350°F (175°C) toaster oven covered in foil until hot and melty.