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Preheat oven to 375 °F.
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Melt the butter in a large skillet over medium heat.
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Add the onion, sun-dried tomatoes and garlic. Saute until tender.
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Stir in the flour.
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Add the cream, milk, and cream cheese gradually, stirring until the cream cheese melts.
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Stir in the chives, parsley, rosemary, salt, and pepper. Cook for 3 minutes, stirring constantly.
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Combine the potatoes and cream sauce in a lightly greased 7×11-inch baking dish.
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Bake, covered, for 1 hour.
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Uncover and sprinkle with the asiago and Parmesan cheeses.
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Bake uncovered, for 15 minutes or until the potatoes are tender.