Cheesy Kohlrabi Gratin is a rich, satisfying, and low-carb twist on the classic potato gratin. By swapping in kohlrabi a crunchy, mildly sweet root vegetable that softens beautifully when baked you get all the creamy, cheesy goodness without the carb overload. Perfect as a hearty side dish or even a light vegetarian main, this gratin offers an indulgent way to enjoy seasonal vegetables while keeping things keto-friendly and gluten-free. The combination of garlic, herbs, and melted cheese creates a golden-brown topping that’s irresistibly comforting.

FULL RECIPE

Ingredients

• 2 medium kohlrabi bulbs, peeled and thinly sliced (about 4 cups)
• 1 tablespoon unsalted butter (for greasing the baking dish)
• 1 tablespoon olive oil
• 1 small yellow onion, finely chopped
• 2 cloves garlic, minced
• 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
• ¾ teaspoon salt
• ¼ teaspoon black pepper
• ½ cup heavy cream
• ¼ cup milk (whole or 2%)
• 1 teaspoon Dijon mustard
• 1 cup shredded Gruyère cheese
• ½ cup shredded sharp cheddar cheese
• ¼ cup grated Parmesan cheese
• 2 tablespoons chopped parsley (optional, for garnish)

Directions

1. Preheat the oven to 375°F (190°C). Lightly grease a medium-sized baking dish with butter.
2. Prepare the kohlrabi by peeling and slicing it into very thin rounds, about 1/8-inch thick. A mandoline works best for even slices.
3. Sauté the aromatics: In a skillet over medium heat, add olive oil. Once hot, sauté the onions for 3–4 minutes until soft and translucent. Add garlic and thyme, cooking for another minute.
4. Make the cream mixture: In a small bowl, whisk together the heavy cream, milk, Dijon mustard, salt, and black pepper.
5. Layer the gratin: Place a third of the kohlrabi slices in the prepared baking dish. Top with a portion of the sautéed onion mixture and a sprinkle of each cheese. Repeat the layers until all ingredients are used, finishing with a generous topping of cheese.
6. Pour the cream mixture evenly over the layered ingredients, allowing it to seep down through the layers.
7. Bake uncovered for 35–40 minutes, or until the kohlrabi is tender and the top is golden and bubbly.
8. Let rest for 5–10 minutes before serving. Garnish with chopped parsley if desired.

Nutrition Facts 

• Calories: 265
• Total Fat: 21g
• Saturated Fat: 12g
• Cholesterol: 65mg
• Sodium: 410mg
• Total Carbohydrates: 9g
• Dietary Fiber: 3g
• Sugars: 3g
• Protein: 11g

The Health Benefits of Kohlrabi in Gratin

Kohlrabi is a powerhouse of nutrients that brings more to the table than just being a low-carb alternative to potatoes. Rich in fiber, vitamin C, potassium, and antioxidants, it helps support immune function, improve digestion, and manage blood pressure. In the context of a gratin, kohlrabi adds all these health benefits without the starch load typically found in traditional versions. Its high water content also makes the dish feel lighter on the stomach, making it a wholesome yet comforting choice for health-conscious eaters.

Low-Carb Comfort Without Compromise

One of the standout features of Cheesy Kohlrabi Gratin is how it successfully replicates the comfort food appeal of classic potato-based gratins while keeping the carb count low. With only around 9 grams of carbohydrates per serving, it fits seamlessly into ketogenic and low-carb diets. Despite the reduction in starch, the dish maintains its creamy texture and satisfying mouthfeel, thanks to the use of rich cheeses and cream. It’s a brilliant way to enjoy indulgent textures without veering off a dietary plan.

Cheese Selection and Flavor Impact

The cheese combination plays a critical role in the overall flavor and texture of the gratin. Gruyère is often the star, lending a nutty, slightly sweet depth that melts beautifully, while sharp cheddar adds boldness and a familiar tang. Parmesan, with its umami richness, brings a salty crispness to the topping. Together, they provide a multi-dimensional cheese flavor that balances creaminess with sharpness. For those who like experimenting, smoked gouda or fontina can be substituted to alter the flavor profile while maintaining meltability.

Customizing the Dish for Dietary Needs

Cheesy Kohlrabi Gratin is inherently gluten-free, making it suitable for those with gluten sensitivities or celiac disease. However, it can also be modified for other dietary preferences. To make it vegetarian, simply ensure the cheeses used are free from animal rennet. For a lower-fat version, swap heavy cream with half-and-half and reduce the amount of cheese, while still keeping enough to retain flavor. Vegan adaptations are also possible using plant-based cheeses and cream alternatives made from cashew or coconut milk, although the flavor and consistency will differ.

Delicious Variations to Try

There are numerous ways to put your own spin on this classic. For added protein, incorporate cooked bacon, pancetta, or crumbled sausage between the layers. Vegetarians can opt for sautéed mushrooms or spinach for an earthy twist. You can also experiment with herbs like rosemary, sage, or chives to tailor the aromatics to your liking. For a spicier version, a dash of cayenne pepper or a layer of sliced jalapeños can provide a pleasant kick that contrasts nicely with the creamy elements.

Perfect Pairings for a Complete Meal

Cheesy Kohlrabi Gratin can serve as a versatile side dish or even stand on its own as a light entrée. When used as a side, it pairs exceptionally well with roasted meats like chicken, pork tenderloin, or a seared steak. It also complements seafood, especially flaky fish or buttery shrimp. To round out the meal, consider a crisp green salad with a citrus vinaigrette or steamed green vegetables like asparagus or broccolini for a well-balanced, nutrient-rich dinner.

Serving Tips for Maximum Appeal

Presentation matters, especially when serving comfort food with a refined twist. Use a cast iron or ceramic baking dish to retain heat and enhance the dish’s rustic charm. After baking, allow the gratin to rest for a few minutes to firm up, making it easier to slice into neat portions. Garnishing with fresh parsley or chives adds a pop of color and a touch of brightness to the otherwise rich dish. For more formal occasions, consider individual ramekins to elevate the plating and offer portion control.

Storage and Reheating Recommendations

Leftover Cheesy Kohlrabi Gratin stores well in the refrigerator for up to 4 days when kept in an airtight container. It can be reheated in the oven at 350°F (175°C) for about 15–20 minutes or until heated through. Microwaving is quicker but may cause the cheese to separate slightly, so using an oven or toaster oven is preferable for preserving the texture. For longer storage, you can freeze the gratin, although the dairy components may alter slightly in texture upon thawing.

Make-Ahead Tips for Busy Cooks

This gratin is an excellent candidate for meal prep or make-ahead entertaining. You can prepare the entire dish a day in advance, cover it tightly, and store it in the fridge until you’re ready to bake. Just allow it to come to room temperature before placing it in the oven to ensure even cooking. Alternatively, you can partially bake it ahead of time, then finish it off just before serving to re-crisp the top and reheat the layers. This flexibility makes it ideal for holiday gatherings or busy weeknight dinners.

Why It’s a Family-Friendly Favorite

Despite being built around a lesser-known vegetable, Cheesy Kohlrabi Gratin is surprisingly appealing to picky eaters, including children. The creamy texture and cheesy top mimic familiar potato dishes, often easing skepticism around the kohlrabi. It’s also a great way to introduce new vegetables to the family table without straying too far from traditional comfort food territory. Since it doesn’t rely on exotic ingredients or strong flavors, it can be appreciated by a wide range of palates.

Conclusion

Cheesy Kohlrabi Gratin proves that comfort food can be both indulgent and health-conscious. By replacing high-carb ingredients with nutrient-rich kohlrabi and layering it with creamy, melty cheese, this dish strikes the perfect balance between flavor and nutrition. Its flexibility in preparation, ability to cater to various diets, and compatibility with a wide array of main dishes make it a valuable addition to any home cook’s repertoire. Whether served as a main or a side, this gratin brings warmth and satisfaction to the table, one low-carb layer at a time.