Heat oven to 400°F. Heat dressing in large skillet on medium-high heat. Add onion and cook 5 minutes; stirring occasionally. Add mushrooms and cook an additional 5 minutes; stirring occasionally.
Spread onion mixture evenly over pizza crust. Top with chicken and cheese.
Bake 15 to 20 minutes or until crust is crisp.
Note: Asiago cheese is an Italian cheese similar to Parmesan and Romano. It works well grated or shredded in salads, soups, and pastas.
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