Melt 1 Tbsp. margarine in large nonstick skillet over medium-high heat and heat chicken, stirring frequently, until heated through, about 2 minutes. Remove chicken and set aside.
Stir in remaining 1 Tbsp. margarine, water and milk into same skillet and bring to a boil over high heat. Stir in Knorr® Italian Sides™ - Alfredo and return to a boil. Reduce heat to medium and cook, stirring occasionally, 8 minutes or until pasta is tender.
Return chicken to skillet, then top with tomato and cheese. Let stand covered until cheese is melted, about 4 minutes. Sprinkle with basil.