Heat Oven To 400 Degrees F. Cook Pasta As Directed On Package, Omitting Salt. Drain Pasta, Reserving 1/3 Cup Cooking Water. Heat 1 Tbsp. Oil In Large Saucepan On Medium Heat. Add Onions And Thyme; Cook And Stir 5 Min. Add Reserved Cooking Water, Cooking Creme And Cheeses; Cook And Stir 2 To 3 Min. Or Until Cheeses Are Melted. Add Pasta; Mix Lightly. Transfer To 9-Inch Square Baking Dish Sprayed With Cooking Spray. Drizzle Remaining Oil Over Bread Cubes; Toss To Coat. Sprinkle Over Pasta Mixture. Bake 12 Min. Or Until Pasta Mixture Is Heated Through And Bread Topping Is Golden Brown.