Name: Sliced Yukon Gold Potato & Egg Breakfast Casserole Recipe
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 2 Tablespoons unsalted butter (plus extra for the pan); ½ cup yellow onion, diced; ½ cup shallot, diced; 3-4 cloves garlic, minced; Pinch red pepper flakes (optional); 1 ½ Tablespoons fresh rosemary, finely chopped; 1 Tablespoon fresh thyme, finely chopped; 6 eggs; ¼ cup half-and-half; 1 ½ teaspoons kosher salt (or to taste); ¼ teaspoon freshly ground black pepper (or to taste); ½ pound Yukon Gold potatoes (approx. 2 medium potatoes), sliced 1/16 inch thick; 3 ounces Gruyere cheese, shredded; ¼ cup Parmesan cheese, shredded; 2 cups arugula

Print Recipe· 3.9 from 6 reviews

If you’re looking for a breakfast dish that feels like a warm hug on a plate, then the Sliced Yukon Gold Potato & Egg Breakfast Casserole Recipe is an absolute must-try. This recipe blends tender, thinly sliced Yukon Gold potatoes with fluffy, herb-infused eggs and melty gruyere and parmesan cheeses, creating layers of flavor and texture that are both comforting and refined. Perfect for weekend brunches or a special breakfast treat, this casserole offers a delightful balance of creaminess, slight crispness on the edges, and fresh green arugula to brighten every bite.

Ingredients You’ll Need

A white speckled bowl holds six brown eggs and is placed in the center on a small wooden cutting board, which also has two whole yellow potatoes and some sprigs of fresh green rosemary and thyme around it. To the left, a metal grater with a partially grated block of pale yellow cheese rests on a white marbled surface, with some shreds of cheese scattered around. Below the board, there are garlic cloves and more green herbs. On the right side, a small white bowl full of shredded cheese and a brass cup with chopped white onions are shown. A deep red cloth is partly visible in the lower right corner. Photo taken with an iphone --ar 4:5 --v 7

Don’t be intimidated by the list—each ingredient plays a simple yet crucial role in making this dish pop. From the earthy herbs lending a fragrant touch to the buttery potatoes that create a velvet texture, these essentials combine harmoniously to deliver a breakfast casserole that’s far from ordinary.

Unsalted butter (2 Tablespoons plus extra): Adds a rich base for sautéing and greasing the pan, ensuring every bite has a silky buttery undertone.
Yellow onion (½ cup, diced): Provides a sweet, caramelized depth once cooked, rounding out savory flavors beautifully.
Shallot (½ cup, diced): Offers a mild, slightly sweet onion flavor that elevates the aromatic profile of the casserole.
Garlic (3-4 cloves, minced): Infuses a warm, savory punch that balances the creaminess perfectly.
Red pepper flakes (pinch, optional): Adds a gentle heat that awakens the palate without overpowering the dish.
Fresh rosemary (1 ½ Tablespoons, finely chopped): Brings a fragrant, woodsy note that pairs beautifully with potatoes and eggs.
Fresh thyme (1 Tablespoon, finely chopped): Adds subtle earthy and slightly minty tones, enhancing every layer of flavor.
Eggs (6): The foundation of the casserole, providing a creamy, custard-like texture that holds everything together.
Half-and-half (¼ cup): Enriches the eggs for a luscious, tender bake that’s perfectly moist.
Kosher salt (1 ½ tsp, or to taste): Seasoning that ensures all ingredients shine without dullness.
Freshly ground black pepper (¼ tsp, or to taste): Adds a peppery kick that livens up the flavor profile.
Yukon Gold potatoes (½ pound, approx. 2 medium, sliced 1/16 inch thick): These gold-colored potatoes are buttery and creamy, providing the perfect texture and flavor for layering.
Gruyere cheese (3 ounces, shredded): Melts smoothly with a slightly nutty character that deepens the casserole’s richness.
Parmesan cheese (¼ cup, shredded): Contributes a sharp, salty tang that crisps up beautifully on top.
Arugula (2 cups): Adds a peppery fresh note as a vibrant, green contrast either on top or as a side.

How to Make Sliced Yukon Gold Potato & Egg Breakfast Casserole Recipe

Step 1: Prepare Your Oven and Baking Dish

First things first, preheat your oven to 350 degrees Fahrenheit to get it nice and ready for baking. Don’t skip greasing your baking dish thoroughly with butter—this small step is essential to prevent the casserole from sticking and adds a delightful buttery edge to the crust.

Step 2: Sauté Your Aromatics

In a medium skillet over medium heat, melt 2 tablespoons of butter and toss in the diced onion and shallot with a pinch of salt. Let them cook gently for a few minutes until soft and translucent. Then add the garlic, red pepper flakes if you want a little spice, freshly chopped rosemary, and thyme. Cook for a few more minutes until everything smells heavenly. Set this aside to cool slightly so it won’t scramble the eggs later.

Step 3: Whisk Together Eggs and Dairy

In a large bowl, whisk together the eggs, half-and-half, salt, and pepper until fully combined and slightly frothy. This mixture will become the rich custard that binds the casserole together, so make sure it’s well beaten and seasoned nicely!

Step 4: Slice the Potatoes Thinly

Using a mandoline to slice your Yukon Gold potatoes as thin as 1/16 inch is critical to ensure they cook fully within the baking time. If your slices are a bit thicker, no worries—parboil them for 2-3 minutes before layering to soften them up. This trick guarantees a tender texture instead of undercooked bites.

Step 5: Layer the Potatoes and Cheese

In your prepared pan, start layering the potato slices evenly across the bottom. Repeat layering if you have enough slices to create two or more thin layers. Next, sprinkle two-thirds of your shredded gruyere and parmesan cheese evenly over the potatoes. Save the remaining cheese to sprinkle on top later for a beautifully browned crust.

Step 6: Combine and Bake

Stir the cooled onion and herb mixture into your whisked eggs gently, then slowly pour this egg mixture over the layered potatoes and cheese, allowing it to seep through the layers. Place your baking dish on a baking sheet to catch any overflow, then slide it into the oven. Bake for about 36-40 minutes or until the edges are golden brown and the center is just set. Keep an eye on it starting around 30 minutes as ovens can vary.

Step 7: Cool and Add Fresh Greens

Once out of the oven, let your casserole rest for 15-20 minutes. This step lets everything settle and makes slicing easier. For a bright, fresh touch, toss the arugula with a drizzle of olive oil and a squeeze of lemon juice and either place it on top of the casserole or serve it alongside. Finish with some freshly cracked black pepper to taste.

How to Serve Sliced Yukon Gold Potato & Egg Breakfast Casserole Recipe

A white scalloped round dish filled with a creamy yellow mixture that contains shredded white cheese, small bits of green herbs, and visible specks of spices, creating a textured surface with soft folds and curls. The dish is placed on a white marbled surface with some scattered herbs and a metal grater with a piece of cheese on the top left side. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

To keep things fresh and vibrant, I love topping this casserole with tossed arugula—the slight bitterness and peppery notes create a perfect balance to the rich, cheesy layers. A light drizzle of olive oil and fresh lemon juice on the greens brightens the whole dish and adds a fresh, tangy contrast.

Side Dishes

This breakfast casserole pairs wonderfully with light, crisp side dishes like fresh fruit salad, cherry tomatoes drizzled with balsamic vinegar, or even a simple spinach and feta salad. These sides elevate the meal, adding color and refreshing flavors that complement the heartiness of the casserole.

Creative Ways to Present

If you’re serving this for a brunch gathering, try slicing the casserole into neat squares and arranging them on a large platter with small bowls of extra cheese, hot sauce, or fresh herbs for guests to customize their bites. Another fun idea is to serve individual portions in mini cast iron skillets or ramekins for a charming, rustic presentation.

Make Ahead and Storage

Storing Leftovers

If you find yourself lucky enough to have leftovers, place them in an airtight container and store in the refrigerator. The casserole will keep well for up to 4 days, retaining much of its flavor and texture when properly covered.

Freezing

This breakfast casserole freezes beautifully! Wrap individual slices or the whole dish tightly in plastic wrap and then foil to prevent freezer burn. It can be stored for up to 2 months. Thaw overnight in the fridge before reheating for best results.

Reheating

To reheat, place the casserole or slices on a baking sheet and warm in a 350-degree Fahrenheit oven for about 15-20 minutes until heated through. This method keeps the edges crisp rather than mushy, which you might get from microwaving.

FAQs

Can I use another type of potato instead of Yukon Gold?

Absolutely, but Yukon Gold potatoes are ideal because of their creamy texture and buttery flavor. Russets may work but might be a bit drier, so parboiling thicker slices becomes even more important.

Is it necessary to slice the potatoes so thinly?

Slicing potatoes thinly ensures they cook evenly and become tender during baking. If you slice too thick, the potatoes may remain firm or crunchy unless you parboil them beforehand.

Can I make this casserole vegetarian or vegan?

This recipe is vegetarian-friendly as is but not vegan due to the eggs and cheeses. For a vegan twist, you could try using plant-based cheese substitutes and an egg replacement, but the texture and taste will differ.

Can I prepare this recipe the night before?

Yes! You can assemble the casserole the night before, cover tightly, and refrigerate. Bake it fresh the next morning, adding a few extra minutes to baking time since it will be cold from the fridge.

How do I know when the casserole is done baking?

The edges should be golden brown, and the center should be just set but still slightly jiggly. Overbaking can dry it out, so begin checking around 30 minutes to ensure perfect doneness.

Final Thoughts

This Sliced Yukon Gold Potato & Egg Breakfast Casserole Recipe is truly a labor of love that rewards you with a dish both elegant and deeply satisfying. It’s a marvelous way to elevate your mornings or wow your brunch guests without fuss or complicated ingredients. I encourage you to give this recipe a try—you’ll likely find it becoming a beloved staple in your culinary repertoire, bringing warmth and joy to every breakfast table.