Preheat oven to 425°F. Spray 15 x 10-inch jelly-roll pan with nonstick cooking spray. Unroll pizza dough on prepared pan. Press dough evenly into pan and 1/2 inch up sides. Prick dough all over with fork. Bake 7 to 10 minutes or until lightly browned.
Heat oil in large nonstick skillet over medium heat. Add onion; cook and stir 8 minutes or until golden brown. Add mushrooms and garlic; cook and stir 4 minutes. Add kale and red pepper flakes; cover and cook 2 minutes to wilt kale. Uncover; cook and stir 3 to 4 minutes or until vegetables are tender.
Spread pizza sauce over crust. Spread kale mixture evenly over sauce; top with cheese. Bake 10 minutes or until crust is golden brown.
Note: Kale has tough stems that should be removed before cooking. To trim away tough stems, make a “V-shaped” cut where the stem joins the leaf. Stack the leaves and cut them into pieces.
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