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.
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Variation: For individual servings, spoon pasta mixture into 4 (1-cup) baking dishes sprayed with cooking spray instead of the 9-inch square baking dish. Top with bread cube topping, then bake as directed.