Melt margarine in large skillet over medium-high heat and cook leek, stirring occasionally, 2 minutes. Stir in shrimp and red peppers and cook, stirring occasionally, 4 minutes or until shrimp turn pink. Stir in olives. Toss with hot Knorr® Italian Sides™ - Creamy Garlic Shells. Serve, if desired, with a spinach salad and warm dinner rolls.