Ingredients:
- 2 large sweet potatoes, peeled and thinly sliced
- 2 large Yukon Gold potatoes, peeled and thinly sliced
- 1 small onion, thinly sliced (optional)
- 2 cups heavy cream (or half-and-half for a lighter version)
- 2 cloves garlic, minced
- 1 tsp fresh thyme (or ½ tsp dried thyme)
- 1 tsp fresh rosemary, finely chopped (or ½ tsp dried rosemary)
- 1 cup shredded Gruyère or cheddar cheese
- ½ cup grated Parmesan cheese
- Salt and pepper, to taste
- 2 tbsp unsalted butter, cut into small pieces
- Fresh parsley, chopped, for garnish (optional)
Instructions:
1. Preheat the oven:
- Preheat your oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
2. Prepare the potatoes:
- Peel and thinly slice the sweet potatoes and Yukon Gold potatoes to about ⅛-inch thick slices. You can use a mandoline for more even slices if you have one.
3. Make the cream mixture:
- In a medium saucepan, heat the heavy cream (or half-and-half) over medium heat.
- Add the minced garlic, thyme, rosemary, salt, and pepper. Stir until the mixture is warm but not boiling. Remove from heat.
4. Layer the potatoes:
- In the greased baking dish, layer half of the Yukon Gold potatoes in an overlapping pattern. Sprinkle with salt and pepper.
- Add a layer of half of the sweet potatoes over the Yukon Gold potatoes, followed by a sprinkling of salt and pepper.
- If using onions, scatter the sliced onions evenly over the sweet potatoes.
5. Add cheese:
- Sprinkle half of the Gruyère (or cheddar) and Parmesan cheese over the potato layers.
6. Repeat layering:
- Add another layer of the remaining Yukon Gold potatoes, then the remaining sweet potatoes.
- Pour the warm cream mixture evenly over the potatoes.
- Sprinkle the rest of the cheese on top and dot the surface with small pieces of butter.
7. Bake:
- Cover the dish with aluminum foil and bake in the preheated oven for 40 minutes. Then remove the foil and bake for an additional 20-25 minutes until the top is golden and bubbly, and the potatoes are tender when pierced with a fork.
8. Garnish and serve:
- Let the potato bake rest for 10 minutes before serving. Garnish with freshly chopped parsley if desired.
This Sweet Potato and Yukon Gold Bake is a perfect side dish for a holiday meal, or even as a comforting weeknight dinner paired with a salad or roasted vegetables!