Melt butter in pan over medium heat. Add onion; cook 3 minutes or until tender. Add sun-dried tomatoes, oregano, salt and pepper, and cook 2 minutes. Lightly spoon flour into a dry measuring cup; level with a knife. Sprinkle tomato mixture with flour; cook 1 minute, stirring constantly. Gradually add milk, stirring with a whisk until blended. Remove from heat; add cheese, stirring until cheese melts. Pour the sauce over the potatoes, tossing gently to coat. Bake at 350 degrees for 20 minutes or until bubbly and golden.
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