“Croque Monsieur” Breakfast Strata
with Prosciutto & Caramelized Onion
- Eggs
- Milk
- Wheat
A strata is a baked egg and bread casserole that makes for an effortlessly indulgent breakfast. With mix-ins providing infinite variations, our strata takes a cue from the French, upgrading regular bread for cubes of sweet, buttery brioche that crisp up as they bake. Baked into the brioche and eggs are caramelized onion, umami-rich prosciutto, and melty white cheddar that browns to perfection. The addition of Dijon mustard and nutmeg complete the picture to create a morning meal that is simply parfait. This recipe is triple the typical servings, providing 6 servings and 12 servings for a 2 person and 4 person box respectively.
Ingredients
2 unit
Eggs
(Contains: Eggs)
1 unit
Onion
1 cup
White Cheddar Cheese
(Contains: Milk)
8 ounce
Cream Sauce Base
(Contains: Milk)
2 teaspoon
Nutmeg
6 unit
Brioche Buns
(Contains: Wheat)
2 ounce
Prosciutto
¼ ounce
Parsley
2 teaspoon
Dijon Mustard
Not included in your delivery
1 teaspoon (tsp)
Sugar
teaspoon (tsp)
Salt
teaspoon (tsp)
Black Pepper
1 teaspoon (tsp)
Cooking Oil
Nutrition Values
Utensils
Cooking Steps
• Adjust rack to middle position (middle and top positions for 12 servings) and preheat oven to 400 degrees. Wash and dry produce. Coat a 9-by-13-inch baking dish (two 9-by-13-inch baking dishes for 12) with nonstick cooking spray. • Dice brioche into ½-inch pieces. • Cut prosciutto into 1½-inch pieces. Roughly chop parsley.
• In a large bowl, whisk together eggs*, cream sauce base, mustard, nutmeg, and half the cheddar until combined. • Add brioche pieces to egg mixture and toss until fully coated. Set aside and allow to soak until ready to use in Step 4.
• Halve, peel, and thinly slice onion. • Heat a large drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add onion and cook, stirring occasionally, until browned and softened, 8-10 minutes. • Add 1 tsp sugar (2 tsp for 12 servings) and a splash of water; cook, stirring, until onion is caramelized and jammy, 2-3 minutes more. Season with pepper.
• Transfer strata mixture to prepared baking dish and spread out in an even layer. (For 12 servings, evenly divide mixture between two prepared baking dishes.) • Spread caramelized onion over strata. Evenly top with prosciutto pieces. TIP: Be sure to get the onion and prosciutto into all the nooks and crannies of the strata! • Sprinkle with remaining cheddar and a pinch of parsley.
• Lightly coat a large piece of aluminum foil (two large pieces of foil for 12 servings) with nonstick cooking spray. Cover baking dish tightly with foil, coated side down. • Bake strata on middle rack until almost set, 20-25 minutes. (For 12, bake on top and middle racks, swapping rack positions halfway through.) • Once strata has baked 20-25 minutes, carefully remove and discard foil. Return to oven and continue to bake until cheese is browned, 10-12 minutes more. TIP: Don’t worry if your strata jiggles a bit! It will fully set as it cools.
• Let strata cool for 5 minutes; cut into 6 pieces (12 pieces for 12 servings). • Divide between plates and sprinkle with remaining parsley. Serve.
Wash hands and surfaces after handling raw eggs. Consuming raw or undercooked eggs may increase your risk of foodborne illness.
Customer reviews
Review summary
Updated on Dec 2025- Flavor: Many loved the savory-sweet balance, but some found the nutmeg overpowering; consider reducing the amount for a milder taste 🌿.
- Ease of prep: Assembly was straightforward, though some felt the prep time was longer than expected, especially for cutting the bread.
- Suggestions: Add more liquid or reduce bread for a moister texture; consider increasing cheese, prosciutto, and onions for richer flavor.
- Leftovers: Several enjoyed it reheated the next day, with some finding it even tastier as leftovers.
- Serving tips: Try pairing with raspberry preserves or fig jam for added flavor; great for brunches or gatherings.
Reviews from our home cooks
I used two less rolls and only one of the onions. I cooked it in a 9x9 pan. I assembled it the night before to allow the bread to absorb the liquid before cooking. It was excellent and still made two meals for two people.
A little too much nutmeg to my taste, and needed extra milk to get things properly soaked. Also takes a lot longer to get the onions properly caramelized, that might should be the task before prepping the buns & custard.
Delicious! It's the type of food you would serve to your overnight out of town guests, or send to a friend or neighbor especially during holidays! But, we loved it for breakfast!
I ended up splitting this into two different nights/meals. The first one was overpowering on the spice (nutmeg I think) so I only used half the recipe amount on the second one and it was perfect
So good. And as a casserole, we got 5-6 portions out of this meal.
This was amazing. I hope you keep providing this box. We served it with some raspberry preserves and the tiny bit of acid really put it over the top. SO GOOD!
Absolutely perfect. I will make this for an Easter brunch!!!
So good! One of the best meals we've gotten from HelloFresh for sure. Will absolutely be making this again!
Easy and delicious combination of sweet spice and savory. I plan to make for Easter brunch.
This was an ok meal. There were two things that kept this from being outstanding. First the amount of Nutmeg. I only did half of what the recipe called for and it was still the most predominant flavor. Second was the cook time. I did the low side of what the recipe called for and it still got over done. Normally I follow the cook times on the recipes and everything turns out perfect.
