Heat oven to 400°F. In medium bowl, mix squash, onion, brown sugar, salt, black pepper and 1 1/2 tablespoons of the oil. Spread mixture in ungreased 13x9-inch (3-quart) glass baking dish. Bake about 20 minutes, stirring occasionally, until squash is tender.
Spray large cookie sheet with Crisco® Original No-Stick Cooking Spray. Unroll pizza crust dough on cookie sheet into 13x9-inch rectangle. Bake at 400°F 7 to 10 minutes or until light golden brown.
Meanwhile, in 10-inch skillet, heat remaining 1/2 tablespoon oil over medium heat. Add pancetta; cook 4 minutes, stirring frequently, until lightly browned. Drain.
Spread pesto over partially baked crust. Top with squash mixture, pancetta, roasted peppers, walnuts and cheeses. Bake 6 to 8 minutes longer or until edges are golden brown. Let stand 5 minutes before serving.