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Meanwhile, in 10-inch nonstick skillet, melt butter with oil over medium heat. Add garlic; cook and stir 1 minute. Add bell pepper, onions, parsley and flour; cook and stir 1 minute. Gradually stir in milk until well blended. Heat to boiling, stirring constantly. Cook 6 to 10 minutes, stirring frequently, until sauce is bubbly and thickened.