A cozy, golden vegetable bake with crispy shredded potato and butternut squash, tender spinach, sweet caramelized onions, salty feta, and a delicious bubbling cheddar crust. Perfect as a vegetarian main dish or hearty side!
Prep Time
25 minutes
Cook Time
50–60 minutes
Total Time
1 hour 15–25 minutes
Servings
6 servings
Ingredients
For the Rosti Bake
2 medium russet potatoes, peeled and coarsely grated
2 cups butternut squash, peeled and coarsely grated
4 cups fresh spinach
1 large yellow onion, thinly sliced
2 tablespoons olive oil, divided
2 cloves garlic, minced
1 teaspoon dried thyme
½ teaspoon dried rosemary
½ teaspoon salt
½ teaspoon black pepper
½ teaspoon smoked paprika
1 large egg
2 tablespoons all-purpose flour or cornstarch
¾ cup crumbled feta cheese
For the Cheddar Crust
1 cup shredded sharp cheddar cheese
2 tablespoons grated Parmesan cheese
1 tablespoon olive oil
¼ teaspoon black pepper
¼ teaspoon dried thyme
Optional Garnish
Fresh parsley or thyme
Extra crumbled feta
A drizzle of olive oil
A pinch of red pepper flakes
Instructions
- Prepare the Vegetables
Preheat oven to 400°F (200°C).
Grate the potatoes and butternut squash. Place them in a clean kitchen towel and squeeze firmly to remove as much moisture as possible. This step is important for achieving a crispy rosti texture.
Wilt the spinach in a large skillet over medium heat for 1–2 minutes. Allow it to cool slightly, then squeeze out excess moisture and roughly chop.
- Caramelize the Onion
Heat 1 tablespoon olive oil in a skillet over medium-low heat.
Add the sliced onion and cook for 12–15 minutes, stirring occasionally, until soft, golden, and caramelized.
Add the minced garlic and cook for another 30–60 seconds. Remove from heat.
- Make the Rosti Mixture
In a large bowl, combine:
Grated potato
Grated butternut squash
Cooked spinach
Caramelized onion and garlic
Egg
Flour or cornstarch
Thyme
Rosemary
Smoked paprika
Salt
Black pepper
Crumbled feta
Mix until everything is evenly combined.
- Assemble the Bake
Lightly grease a 9×9-inch or similar baking dish with olive oil.
Transfer the vegetable mixture to the dish and press it down firmly into an even layer.
Brush or drizzle the remaining olive oil over the top.
- Bake the Rosti Base
Bake uncovered for approximately 35–40 minutes, until the vegetables are cooked through and the top is beginning to turn golden and crisp.
- Add the Cheddar Crust
Remove the dish from the oven.
Sprinkle the shredded cheddar and Parmesan evenly over the top. Add a little black pepper and dried thyme.
Return to the oven and bake for another 10–15 minutes, until the cheese is melted, bubbling, and deeply golden around the edges.
For an extra-crispy top, broil for 1–2 minutes, watching carefully so the cheese doesn’t burn.
- Rest and Serve
Let the bake rest for 8–10 minutes before slicing.
Garnish with fresh parsley or thyme and extra feta if desired.
Serve warm as a vegetarian main course, brunch dish, or hearty side.
Tips for the Crispiest Rosti
Squeeze the vegetables very well. Excess moisture is the biggest enemy of crispy rosti.
Use russet or other starchy potatoes for the best texture.
Don’t overcrowd the baking dish.
Press the mixture firmly into an even layer.
For an even crispier bottom, preheat the greased baking dish for several minutes before adding the mixture.
Broil briefly at the end for a beautifully browned cheddar crust.
Easy Substitutions
Potato: Yukon Gold potatoes can be used.
Butternut squash: Sweet potato or pumpkin can replace it.
Spinach: Kale or Swiss chard can be substituted.
Feta: Goat cheese or ricotta can be used.
Cheddar: Gruyère, mozzarella, or Monterey Jack work well.
Flour: Use cornstarch or a gluten-free flour blend for a gluten-free version.
Egg: A flax egg can be used, although the texture may be slightly softer.
Nut Information & Allergens
This recipe contains no nuts or tree nuts as written.
Potential allergens:
Milk/dairy: Feta, cheddar, and Parmesan
Egg: Used as a binder
Gluten: May be present in regular all-purpose flour
Nut-Free
Yes, naturally nut-free when prepared according to the recipe.
Gluten-Free
Use cornstarch or certified gluten-free flour instead of regular all-purpose flour.
Vegetarian
Yes.
Vegan
Not as written. Use a plant-based egg substitute and dairy-free feta/cheddar alternatives.
Cross-contamination note: If preparing this for someone with a severe nut allergy, check cheese, flour, and other packaged ingredients for facility or cross-contact warnings.
Approximate Nutrition Per Serving
Based on 6 servings; values vary depending on exact ingredients and cheese used.
Calories: ~390 kcal
Protein: ~15 g
Carbohydrates: ~42 g
Fat: ~19 g
Fiber: ~6 g
Sugar: ~6 g
Sodium: ~650 mg
Storage & Reheating
Store leftovers in an airtight container in the refrigerator for up to 3–4 days.
Reheat in a 375°F (190°C) oven or air fryer until hot and crisp. Avoid microwaving if you want to maintain the crispy texture.
The assembled, unbaked mixture can also be prepared several hours ahead and refrigerated before baking.
Recipe Q&A
Can I make this ahead of time?
Yes. Assemble the bake several hours ahead, cover, and refrigerate. Bake when ready, adding a few extra minutes to the cooking time if necessary.
Why is my rosti not crispy?
The most common reason is excess moisture. Squeeze the grated potato, butternut squash, and spinach extremely well before mixing.
Can I use frozen spinach?
Yes. Thaw it completely and squeeze out as much liquid as possible before adding it.
Can I use sweet potato instead of butternut squash?
Absolutely. Sweet potato works very well and gives the bake a slightly sweeter flavor.
Can I make it gluten-free?
Yes. Replace the all-purpose flour with cornstarch or a certified gluten-free flour.
Can I make this without eggs?
Yes. Use a flax egg or another suitable egg replacer. The bake may be slightly less firm.
Can I add more protein?
Yes. Add cooked chicken, turkey, lentils, chickpeas, or extra cheese. Keep additional moisture low so the rosti stays crisp.
Can I freeze it?
Yes. Allow it to cool completely, portion it, wrap well, and freeze for up to about 2 months. Thaw overnight in the refrigerator and reheat in the oven.
What should I serve with it?
It pairs beautifully with a simple green salad, roasted vegetables, grilled chicken, baked fish, or a dollop of Greek yogurt.
Is this suitable for meal prep?
Yes. It keeps well in the refrigerator and reheats nicely in an oven or air fryer, making it a great make-ahead lunch or dinner.
How do I get an extra-crispy cheese crust?
Use sharp cheddar, spread it evenly across the top, and finish under the broiler for 1–2 minutes. Watch it closely because cheddar can brown quickly.
Can I make individual portions?
Yes. Divide the mixture among greased ramekins or muffin tins and adjust the baking time depending on the size of the portions.
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