You are here: Home » Recipes » Two-Potato Gratin Two-Potato Gratin Recipe by Favorite Recipes Press Yield 6 to 8 servings This easy-to-make dish is cooked in the microwave. PrintEmail Ingredients 2 large Russet potatoes (about 1 1/4 pounds), peeled, thinly sliced.1 tablespoon minced fresh rosemary, or 2 teaspoons dried and crumbled.2 -- orange-flesh sweet potatoes (about 1 pound), peeled, thinly sliced.1 1/2 cups whipping cream1 cup grated Swiss cheese1/3 cup grated Parmesan cheese Instructions Arrange half of russet potatoes in 8x8x2-inch glass baking dish. Season with salt and pepper. Sprinkle 1/4 of rosemary over russet potatoes. Top with half of sweet potatoes. Season with salt and pepper. Sprinkle 1/4 of rosemary over. Repeat layering with remaining russets and sweet potatoes, seasoning each layer with salt, pepper and 1/4 of rosemary. Pour cream over. Cover tightly with plastic wrap and microwave on high until potatoes are tender, about 18 minutes. Sprinkle both cheeses over potatoes. Microwave uncovered on high until cheeses melt and bubble, about 3 minutes. Cool 10 minutes. Recipe reprinted with permission from the Junior League of Tyler’s And Roses for the Table (The Junior League of Tyler, Texas 1997).