Preheat oven to 425°F (220°C). Cook pasta according to package directions; drain. Grease 8-in (2 L) baking dish; set aside.
Toss cheeses together in medium bowl. Combine crumbs with 1/4 cup (60 mL) cheese mixture in another medium bowl; set aside.
Melt margarine in medium saucepan. Add 2 Tbsp (30 mL) to crumb mixture and toss. Add milk to saucepan with remaining spread and whisk in Knorr® Alfredo Pasta Sauce Mix; bring to a boil over medium-high heat and cook, whisking, until slightly thickened.
Return cooked pasta to pasta pot. Stir remaining cheese and if desired, a pinch of nutmeg into Sauce; pour over pasta and toss to mix. Pour into prepared baking dish. Sprinkle with crumb mixture.