What is a Spinach Florentine breakfast casserole?

A Spinach Florentine breakfast casserole is a baked egg dish that layers eggs with cooked spinach, cheese, and bread, potatoes, or a crust for texture. It borrows flavors from classic “Florentine” dishes—spinach and creamy cheese—so you’ll often find Gruyère, Parmesan, or a béchamel-style sauce mixed with beaten eggs. Variations add ham, mushrooms, or tomatoes. It’s a hearty, make-ahead breakfast or brunch option that serves a crowd and keeps well as leftovers.

How long does a Spinach Florentine breakfast casserole take to bake and how do I know it’s done?

Bake at 350°F (175°C) for about 30–40 minutes in a standard 9x13 pan. The casserole is done when the center reaches 160°F (71°C) and the edges are set. Quick checks: insert a knife or toothpick near the center — it should come out mostly clean with no runny egg; the middle may jiggle slightly but won’t be liquid. Let the casserole rest 10–15 minutes before slicing to finish setting.

How should I store and reheat leftover Spinach Florentine breakfast casserole?

Refrigerate leftovers within 2 hours of baking in an airtight container for 3–4 days. For longer storage, freeze portions or the whole casserole up to 3 months; wrap tightly with plastic and foil. To reheat refrigerated portions, warm in a 350°F (175°C) oven for 12–18 minutes covered, or microwave covered in 30–60 second bursts until hot. For frozen portions, thaw overnight in the fridge then heat as above, or bake from frozen adding 10–15 minutes.

Can I assemble a Spinach Florentine breakfast casserole the night before or freeze it unbaked?

Yes. Assemble in the pan, cover tightly, and refrigerate overnight for easier weekday mornings—bake straight from chilled, adding a few extra minutes if needed. To freeze unbaked, wrap the assembled dish well and freeze up to 3 months. Thaw in the fridge overnight before baking, or bake from frozen and add about 15–25 minutes to the cooking time, covering with foil if the top browns too quickly. Par-cook and squeeze excess liquid from spinach before assembling.

What substitutions and tips stop a Spinach Florentine breakfast casserole from getting soggy?

Prevent sogginess by squeezing cooked or thawed spinach dry, using day-old or toasted bread, and lightly sautéing watery vegetables first. Use firmer cheeses (like aged cheddar or Gruyère) and moderate liquid (milk or cream); reduce added liquids if using wet add-ins. Gluten-free swaps: use gluten-free bread or hash browns. Dairy-free: choose unsweetened plant milk and a melty vegan cheese. For protein swaps, add cooked sausage or replace some eggs with silken tofu for a denser texture. For related variations, link to your gluten-free or vegetarian casserole recipes.

Spinach Florentine Breakfast Casserole 5 Make Ahead Tips

Name: Spinach Florentine Breakfast Casserole
Prep time: 30 min
Cook time: 35 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: – 1 pound bulk pork sausage for savory protein-packed base; – 2 tablespoons butter for sautéing veggies with richness; – 1 large onion, chopped for natural sweetness and depth; – 1 cup sliced fresh mushrooms for earthy umami; – 1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry for Florentine spinach punch; – 12 large eggs for fluffy, custardy binding; – 2 cups 2% milk for creamy pour-over; – 1 cup shredded Swiss cheese for nutty creaminess; – 1 cup shredded sharp cheddar cheese for bold tang; – 1/4 teaspoon paprika for subtle smoke and color

Ingredients

– 1 pound bulk pork sausage for savory protein-packed base

– 2 tablespoons butter for sautéing veggies with richness

– 1 large onion, chopped for natural sweetness and depth

– 1 cup sliced fresh mushrooms for earthy umami

– 1 package (10 ounces) frozen chopped spinach, thawed and squeezed dry for Florentine spinach punch

– 12 large eggs for fluffy, custardy binding

– 2 cups 2% milk for creamy pour-over

– 1 cup shredded Swiss cheese for nutty creaminess

– 1 cup shredded sharp cheddar cheese for bold tang

– 1/4 teaspoon paprika for subtle smoke and color

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Instructions

1-First Step: Preheat and Prep the DishPreheat your oven to 350°F. Grease a 13×9-inch baking dish with cooking spray or butter. This prevents sticking and ensures easy slicing later. For gluten-free, no change needed.

2-Second Step: Cook the SausageCook 1 pound bulk pork sausage in a large skillet over medium heat for 6 to 8 minutes. Break it into crumbles until no longer pink. Drain excess fat, then spread evenly in the prepared dish. Vegan swap: Use plant-based sausage and cook similarly.

3-Third Step: Sauté the VegetablesIn the same skillet, melt 2 tablespoons butter over medium-high heat. Add 1 large chopped onion and 1 cup sliced fresh mushrooms. Cook 3 to 5 minutes until tender. Stir in 1 package (10 ounces) thawed and squeezed-dry frozen chopped spinach. Spoon this mixture over the sausage. Squeezing spinach dry keeps things firm; low-carb folks love this veggie layer.

4-Fourth Step: Mix the Egg CustardIn a large bowl, whisk 12 large eggs with 2 cups 2% milk until blended. Pour evenly over the sausage and veggies. This soaks in for a strata-like texture. For low-carb, use half-and-half instead of milk if desired.

5-Fifth Step: Add Cheeses and SeasoningSprinkle 1 cup shredded Swiss cheese and 1 cup shredded sharp cheddar over the top. Dust with 1/4 teaspoon paprika for color and mild spice. Vegetarian version skips sausage here.

6-Final Step: Bake and RestBake uncovered for 30 to 35 minutes. Check doneness: center at 165°F, or knife near center comes out clean. Let stand 10 minutes to set. Slice and serve warm. For make-ahead brunch casserole, it reheats beautifully.

Last Step:

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Notes

🥬 The presence of spinach is what distinguishes Eggs Florentine from Eggs Benedict
❄️ Refrigerate leftovers within 2 hours; keep in the refrigerator 3–4 days or freeze up to 3 months
🌡️ Ensure the casserole reaches the recommended internal temperature of 165°F to be fully set and safe to eat

Author: Brandi Oshea
Prep Time: 20 minutes
Standing time: 10 minutes
Cook Time: 35 minutes
Category: Breakfast
Method: Baking
Cuisine: American
Diet: None

Nutrition

Serving Size: 1 piece
Calories: 271
Sugar: 4
Sodium: 344
Fat: 20
Saturated Fat: 9
Unsaturated Fat: 11
Trans Fat: 0
Carbohydrates: 6
Fiber: 1
Protein: 16
Cholesterol: 226