Baking

Hearty Make-Ahead Chicken and Spinach Strata Casserole

Name: Hearty Make-Ahead Chicken and Spinach Strata Casserole
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Yield: 4 servings
Ingredients: 1 cup shredded or diced chicken; 8 oz frozen spinach, 2 packets, chopped; 7 cup French bread, cut into 1-inch (2 cm) cubes; 1 cup grated cheese; 0 Parsley, finely chopped; 6 eggs; 1.25 cup milk; 0.25 cup grated parmesan; 1 tsp salt; 0 Black pepper

Leftover bread soaks up a rich batter to create a satisfying base for this easy cheesy chicken and spinach strata bread bake.

By Ally
Updated August 31, 2026 · Why trust this?

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A freshly baked chicken and spinach bread casserole in a square baking dish. — Photograph by the CookingMyRecipes kitchen

Total

25 min

Prep

10 min

Cook

15 min

Serves

Level

Advanced

Got some leftover bread and a few cooked chicken breasts in the fridge? A Hearty Make-Ahead Chicken and Spinach Strata Casserole turns everyday leftovers into a complete meal. The soaked bread forms a sturdy base that bakes into a satisfying dinner. This reliable dish yields 4 to 5 portions.

The bread and eggs

You need enough bread cubes to cover a 10-inch (25 cm) square baking dish twice. Cut the bread into 1-inch (2 cm) pieces so the casserole is easy to eat. Squish the bread down as you build the layers in the pan. This compression forces the cubes to absorb the egg and milk mixture evenly.

Stale bread takes a full 30 minutes of resting time to soak up the liquid. You can assemble this dish a day ahead if that fits your schedule better. An overnight rest requires one extra egg and a quarter cup of milk. The baked strata will turn out dry if you leave this extra liquid out.

Preparing the spinach

Frozen spinach holds a lot of water. You must squeeze the defrosted greens hard to remove this excess moisture. Watery vegetables stop the egg mixture from setting in the oven. You can swap frozen spinach for fresh spinach. Shred the fresh leaves and pan-fry them briefly. This step cooks out the liquid before you add them to the dish.

Protein and cheese options

The standard recipe uses cooked chicken and a basic melting cheese like cheddar or tasty. You can swap the chicken for ham, drained canned tuna, or diced bacon. Fry the bacon first and cut the salt in the egg mixture by half.

You can replace the shredded cheese with dollops of ricotta. Add an extra quarter teaspoon of salt to the eggs if you choose mild mozzarella. You can even leave the cheese out entirely. Just increase the salt slightly to balance the missing cheese.

Baking formats

The standard method uses a single baking dish baked at 350°F (180°C). Cover the dish with foil for 20 minutes to heat the center. Remove the foil and finish it uncovered for 10 minutes until the top turns golden. You can also portion the unbaked casserole into four individual ramekins. Bake these smaller portions for 15 minutes. Finish the dish with chopped parsley right before you eat.

Freezer Storage

You can build the casserole and freeze it unbaked for another day. Wrap the dish tightly to protect the food from the cold. Defrost the frozen casserole completely before you put it in the oven.

The Recipe serves 4 · 25 min

Hearty Make-Ahead Chicken and Spinach Strata Casserole

Serves 4

Ingredients

1 cup shredded or diced chicken, or any other cooked protein like ham or bacon
8 oz frozen spinach, 2 packets, chopped
7 cup French bread, cut into 1-inch (2 cm) cubes
1 cup grated cheese, any melting cheese is fine like tasty, cheddar, or mozzarella
Parsley, finely chopped, optional garnish

Egg Mixture

6 eggs
1.25 cup milk
0.25 cup grated parmesan
1 tsp salt
Black pepper

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Method

Preheat the oven to 350°F (180°C).

Defrost the frozen spinach on high for 4 minutes. Squeeze the greens hard to wring out the excess water. Timer 4 min

Egg Mixture

Whisk the eggs, milk, parmesan, salt, and black pepper together in a bowl until combined.

Spread half of the bread cubes into a 10" x 10" (25 cm x 25 cm) baking dish.

Squish down the bread. This compresses the cubes so the liquid soaks in evenly.

Layer the dry spinach and the chicken evenly over the bread. Scatter half of the grated cheese over the meat and greens.

Place the remaining bread on top. Scatter the rest of the grated cheese over the cubes.

Pour the egg mixture over the pan to coat all the pieces evenly. Squish down the strata one last time.

Set aside the dish so the liquid absorbs. Wait 15 minutes at a minimum, though a full 30 minutes is better. Timer 15 min

Cover the baking dish with foil. Bake the covered dish for 20 minutes. Timer 20 min

Remove the foil. Bake the uncovered dish for a further 10 minutes until it looks golden on top. Timer 10 min

Sprinkle the chopped parsley over the dish. Serve the strata immediately.

Freezer Storage

You can save this meal for another day. Cover the baking dish tightly. Place the dish in the freezer. Defrost the strata all the way through before you bake it.

Nutritionper serving

470

Calories

37.3g

Protein

34.1g

Carbs

20.9g

Fat

Nutrition Facts

Amount per serving

Calories 470Calories from fat 188

% Daily Value*

Fat 20.9g27%

Saturated fat 10.3g52%

Cholesterol 312mg104%

Sodium 1333mg58%

Carbohydrates 34.1g12%

Fiber 2.6g9%

Sugar 4.9g10%

Protein 37.3g75%

* Percent Daily Values are based on a 2000-calorie diet (FDA daily values) and are computed automatically.

Nutrition is estimated and provided for convenience. Source: Edamam.

Cook's notes

Substitutions

Fresh spinach makes a wonderful substitute for frozen if you shred it and pan-fry it briefly first to remove any extra moisture.

If you decide to swap the chicken for diced and fried bacon, be sure to cut the salt in the egg mixture by half so your bake does not become too salty.

Dollops of creamy ricotta cheese or shredded mozzarella work beautifully in this dish, but remember to add an extra quarter teaspoon of salt if you choose mozzarella.

Storage

If you plan to assemble the dish a day ahead and leave it in the fridge overnight, whisk one extra egg and a quarter cup of milk into your mixture to keep the texture perfectly moist.

For perfect Freezer Storage, cover the unbaked casserole tightly and ensure it is defrosted completely before it goes into the oven.

Serving

For a lovely personalized presentation, you can easily divide the ingredients into four individual ramekins and bake them for just fifteen minutes.

Common mistakes

Failing to wring all the excess water out of your thawed spinach will make the egg mixture watery and prevent it from setting properly.

Techniques

If you are using stale bread, give the Hearty Make-Ahead Chicken and Spinach Strata Casserole a full thirty minutes to rest before baking so the dry cubes can absorb every drop of the liquid.

Always press down firmly on the bread layers as you build the dish because this simple compression helps the liquid soak in much more evenly.

Letting an egg bake rest for five to ten minutes after removing it from the oven allows the custard to finish setting and makes slicing incredibly easy.

Grating your own cheese from a block rather than buying pre-shredded bags will always give your casseroles a much smoother and meltier finish.

Make ahead, store & reheat

Store: If you plan to assemble the dish a day ahead and leave it in the fridge overnight, whisk one extra egg and a quarter cup of milk into your mixture to keep the texture perfectly moist. For perfect Freezer Storage, cover the unbaked casserole tightly and ensure it is defrosted completely before it goes into the oven.

Frequently asked

Can I leave the cheese out if I want a lighter meal?

You can absolutely omit the cheese entirely from the Hearty Make-Ahead Chicken and Spinach Strata Casserole. Just be sure to slightly increase the salt measurement in your egg mixture to balance out the missing savory flavors.

Is it possible to use canned tuna instead of cooked chicken?

Yes, drained canned tuna makes a fantastic and easy swap for the chicken in this dish. Just make sure to drain the fish very well so you do not introduce extra liquid into the eggs.

Do I need to thaw the casserole before baking it from Freezer Storage?

Yes, you must defrost the frozen casserole completely before it goes into the oven. If you try to bake it while it is still frozen solid, the center will not cook evenly.

Why does the recipe ask me to cover the baking dish with foil at first?

Baking the dish covered for the first 20 minutes helps the egg mixture heat evenly without drying out the surface. Removing the foil for the final 10 minutes is what gives the top layer of bread that beautiful golden finish.

How can I tell when an egg casserole is completely done baking?

You will know it is ready when the center is slightly puffed and no longer jiggles when you gently shake the pan. A butter knife inserted right into the middle should also come out clean.

What are the best side dishes to pair with a baked strata?

Since this type of dish is already packed with protein and carbohydrates, it is wonderful to keep your sides light. A crisp green salad tossed in a bright vinaigrette or a side of fresh fruit balances out the rich meal perfectly.

Why did my bread casserole turn out mushy instead of firm?

Mushy casseroles usually happen if the bread was too fresh and soft, which prevents it from holding its structure when soaked in liquid. Using sturdy or slightly stale bread is the best way to get that perfect hearty texture.

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