Directions:
- Preheat oven to 350°.
- Place potatoes in a large stockpot; cover with stock. Bring mixture to a boil; cook 4 minutes. Remove from heat. Carefully remove potatoes from pot using a slotted spoon, reserving cooking liquid. Arrange potato slices in a single layer on a jelly-roll pan; set aside. Strain cooking liquid through a fine-mesh sieve over a bowl; reserve 1 cup cooking liquid. Discard solids and remaining cooking liquid.
- Heat a medium saucepan over medium heat. Add oil to pan. Sprinkle flour over oil; cook 1 minute, stirring constantly with a whisk. Add garlic; cook 2 minutes, stirring frequently. Combine milk and reserved 1 cup cooking liquid. Gradually pour milk mixture into flour mixture in pan, stirring constantly with a whisk. Add thyme sprigs to pan. Bring mixture to a boil; cook 4 minutes or until slightly thick, stirring frequently. Remove from heat. Strain mixture through a fine-mesh sieve over a bowl, reserving sauce; discard solids. Stir 1/2 teaspoon salt, pepper, and Gruyère cheese into sauce.
- Spread 1/2 cup sauce in bottom of a broiler-safe 2-quart ceramic baking dish coated with cooking spray. Arrange a single, flat layer of sweet potato and then baking potato slices over sauce. Over flat layer, alternate baking potato and sweet potato slices, in shingle-like fashion. Sprinkle evenly with remaining 1/4 teaspoon salt, 1 tablespoon chives, and chopped thyme; pour remaining sauce over potato mixture. Sprinkle with Parmigiano-Reggiano cheese. Bake at 350° for 1 hour or until potatoes are tender when pierced with a knife.
- Remove gratin from oven. Preheat broiler to high.
- Place gratin in oven. Broil gratin 3 minutes or until browned. Sprinkle with remaining 1 tablespoon chives.
Nutrition Facts
| Amount Per 1 Serving | |||
| Calories | 1927.29 Kcal (8069 kJ) | ||
| Calories from fat | 571.76 Kcal | ||
| % Daily Value* | |||
| Total Fat | 63.53g | 98% | |
|---|---|---|---|
| Cholesterol | 124.09mg | 41% | |
| Sodium | 2564.64mg | 107% | |
| Potassium | 2605.1mg | 55% | |
| Total Carbs | 273.24g | 91% | |
| Sugars | 39.84g | 159% | |
| Dietary Fiber | 31.47g | 126% | |
| Protein | 68.63g | 137% | |
| Vitamin C | 25.3mg | 42% | |
| Vitamin A | 5.3mg | 177% | |
| Iron | 6.1mg | 34% | |
| Calcium | 1816.4mg | 182% | |
| Amount Per 100 g | |||
| Calories | 107.57 Kcal (450 kJ) | ||
| Calories from fat | 31.91 Kcal | ||
| % Daily Value* | |||
| Total Fat | 3.55g | 98% | |
|---|---|---|---|
| Cholesterol | 6.93mg | 41% | |
| Sodium | 143.15mg | 107% | |
| Potassium | 145.4mg | 55% | |
| Total Carbs | 15.25g | 91% | |
| Sugars | 2.22g | 159% | |
| Dietary Fiber | 1.76g | 126% | |
| Protein | 3.83g | 137% | |
| Vitamin C | 1.4mg | 42% | |
| Vitamin A | 0.3mg | 177% | |
| Iron | 0.3mg | 34% | |
| Calcium | 101.4mg | 182% | |
* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.
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