This white chicken lasagna has been a weeknight lifesaver in my kitchen for years. I first pulled this combination together the night after a busy weekend when a rotisserie chicken and a tub of ricotta were left in the fridge. What started as a practical way to use leftovers turned into a family favorite: tender layers of noodle, a silky ricotta mixture, and a velvety white sauce enriched with cream and parmesan. The top browns into a bubbly, golden crust that makes everyone gather at the table.

I love how this dish balances rich and bright elements. The ricotta mixture keeps each bite creamy without being heavy, while chopped baby spinach adds freshness and color. Using a store-bought rotisserie bird speeds assembly and infuses the casserole with roast chicken flavor. It’s the kind of comforting food that arrives at the table warm and confident—fussy enough to impress guests, but straightforward enough for a busy weeknight.

Ingredients

• Whole milk ricotta (15 oz.): Look for a creamy ricotta in a refrigerated tub rather than the dry, shelf-stable kind. Brands like Galbani or BelGioioso give a smooth texture that blends easily and keeps the layers creamy.
• Shredded mozzarella (1 1/2 cups + 1/2 cup for the ricotta mix): Use low-moisture part-skim if you want less runoff; whole-milk mozzarella melts more luxuriously and browns nicely on top.
• Grated Parmesan (1/4 cup + 1/4 cup for the sauce): Freshly grated Parmigiano-Reggiano beats pre-grated powder for flavor and melt quality—buy a wedge and grate it yourself when possible.
• Large egg (1): Binds the ricotta so it spreads cleanly between the noodles and won’t weep during baking.
• Rotisserie chicken (about 3 cups shredded): Skin removed and meat shredded—using a pre-cooked bird saves time and adds roasted flavor.
• Lasagna noodles (9): Regular boiled noodles work well here; no-precook oven-ready noodles can be used if you adjust sauce moisture slightly.
• Butter (4 Tbsp), onion (1 yellow, diced), garlic (2 cloves): These form the base for the white sauce—sauté until onion is translucent for sweet, mellow flavor.
• All-purpose flour (1/4 cup) & chicken broth (2 cups): Make a roux with butter and flour, then whisk in broth to achieve a smooth, lump-free sauce.
• Heavy cream (1 cup): Adds silkiness; you can reduce to half-and-half for a lighter version but the texture will be slightly thinner.
• Baby spinach (3 cups, chopped): Stirred into the sauce to wilt gently and disperse bright color and nutrients through the layers.
• Seasonings: Italian seasoning, salt, black pepper, garlic powder—adjust to taste but taste the sauce before assembly and correct seasoning.

Instructions

Prepare the ricotta mixture: In a medium bowl combine 15 ounces whole milk ricotta, 1/2 cup shredded mozzarella, 1/4 cup grated parmesan and 1 large beaten egg with 1/4 teaspoon freshly cracked black pepper. Mix until homogeneous; the egg helps the filling set so slices hold their shape after baking. Shred the chicken: Remove skin and pull meat from a rotisserie chicken until you have about 3 cups shredded. Use two forks to shred against the grain for tender strands, or chop coarsely for chunkier bites. Keep chilled until assembly to avoid diluting the sauce. Cook the noodles: Bring a large pot of water to a rolling boil, season with 1/2 tablespoon salt, and cook 9 lasagna noodles until tender or al dente according to package directions. Drain and spread on a lightly oiled baking sheet so they don’t stick together while you finish the sauce. Make the white sauce: Preheat oven to 375°F. In a large skillet melt 4 tablespoons butter over medium heat, add one diced yellow onion and sauté with 2 minced garlic cloves until translucent, about 3 to 4 minutes. Sprinkle in 1/4 cup flour and cook until the raw smell disappears and the roux is pale golden. Gradually whisk in 2 cups chicken broth, then add 1 teaspoon Italian seasoning, 1/2 teaspoon salt, 1/4 teaspoon black pepper, 1/4 teaspoon garlic powder, and 1 cup heavy cream. Simmer until slightly thickened—about 3 to 5 minutes—then stir in 1/4 cup grated parmesan and 3 cups chopped baby spinach until wilted and evenly distributed. Assemble: Spread about 1 cup of sauce across the bottom of a 9×13-inch casserole dish. Lay three noodles in a single layer, then spread one-third of the ricotta mixture evenly over the noodles and sprinkle with one-third of the shredded chicken. Repeat two more times: sauce, noodles, ricotta, chicken. Finish with remaining sauce and top with 1 1/2 cups shredded mozzarella. Bake and finish: Bake in the preheated 375°F oven for 25 minutes until cheese is melted and edges bubble. Switch the oven to broil and broil 3 to 4 minutes, watching closely, until the top achieves a light golden-brown. Let rest 10 minutes before slicing into nine or twelve portions. Garnish with chopped parsley if desired.

Storage Tips

To store leftovers, cool the dish to room temperature for no more than two hours, then cover tightly with aluminum foil or an airtight lid and refrigerate. Individual portions are easiest to reheat: place in a microwave-safe container and cover with a damp paper towel to retain moisture, or reheat in a preheated 350°F oven for 15–20 minutes until warmed through. For freezing, wrap the whole assembled unbaked pan twice—first with plastic wrap, then heavy-duty foil—or freeze single slices in freezer-safe containers. Thaw overnight in the fridge before reheating to maintain texture; avoid refreezing after reheating.

Ingredient Substitutions

If you need to adapt the ingredients, there are several easy swaps. Substitute half-and-half for heavy cream to reduce richness—expect a thinner sauce, so consider reducing broth by 1/4 cup. Use cottage cheese blended briefly for a slightly lighter ricotta consistency, or ricotta made from part-skim milk to cut fat. For a gluten-free option, choose certified gluten-free lasagna noodles or thinly sliced roasted eggplant as noodle replacements (briefly roast eggplant first to remove excess moisture). For a vegetarian version, replace chicken with roasted mushrooms, artichoke hearts, or lentils and swap chicken broth for vegetable broth.

Serving Suggestions

Serve this casserole with a crisp green salad—arugula with lemon vinaigrette cuts through the richness—or roasted seasonal vegetables such as asparagus in spring or caramelized carrots in winter. A bright tomato and cucumber salad offers a refreshing counterpoint. Garnish slices with fresh parsley or chives and a small drizzle of good extra-virgin olive oil for sheen. For an indulgent meal, pair with garlic bread and a bottle of unoaked Chardonnay or a light-bodied Pinot Noir.

Cultural Background

This layered, creamy casserole is an Americanized twist on traditional Italian lasagna, swapping tomato-based ragu for a béchamel-inspired white sauce and using roast chicken in place of ground meat. White lasagnas have regional roots across Italy and Europe, where cooks replace tomatoes with cream or cheese-based sauces for an indulgent variation. Over time, home cooks in the U.S. adapted these ideas to local ingredients—rotisserie chickens, pre-shredded cheeses, and boxed noodles—creating reliably comforting casseroles that blend pantry convenience with old-world techniques like making a roux for a velvety sauce.

Seasonal Adaptations

Adjust the greens and aromatics by season: in spring, add ramps or chopped asparagus; in summer fold in fresh basil and pea shoots; autumn calls for roasted butternut squash or kale. Swap heavy cream for a lighter dairy blend in warmer months, and increase herbs like thyme and sage in colder months for a heartier profile. For holiday gatherings, add a thin layer of caramelized onions for a sweet-savory touch or sprinkle toasted walnuts and sage breadcrumbs on top for texture and festive flavor.

Meal Prep Tips

For efficient meal prep, assemble the lasagna up to 24 hours in advance, tightly covered in the refrigerator. If freezing for later, assemble and freeze unbaked, then remove plastic and cover with foil before placing in the oven; add 10–15 minutes to the baking time if baking from frozen and keep it covered for the first 30 minutes to avoid over-browning. Portion into individual airtight containers for grab-and-go lunches, and label with date and reheating instructions to simplify weekday meals.

This dish is a welcome bridge between weekday practicality and weekend-worthy comfort. Whether you scale it up for a dinner party or make it for family leftovers, it’s one of those reliable, flexible dishes that keeps returning to our table—each time with a new little tweak that reminds me why I love cooking and sharing food.