Hearty Swiss Potato Casserole

By Tara

4.0 / 5

15min

1h 01min

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¼ cup butter
¼ cup whole wheat flour
1 ⅔ cups water divided
1 ½ teaspoons cornstarch
1 pinch salt and ground black pepper to taste
½ teaspoon ground thyme
½ teaspoon dried rosemary
¾ cup shredded Swiss cheese
¾ cup shredded Swiss Gruyere cheese
3 medium potatoes peeled and thinly sliced
2 scallions finely chopped
1 clove garlic minced