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In 12-inch skillet, heat 1 tablespoon of the oil over medium-high heat. Add sausage; cook 5 to 7 minutes, stirring frequently, until no longer pink. Add onion, garlic, salt, black pepper and red pepper flakes; continue to cook 3 to 4 minutes, stirring frequently, until vegetables have softened slightly. Sprinkle flour over top, and cook 2 minutes, stirring constantly.