Preheat oven to 450°.
Place first 4 ingredients in a blender or food processor, and process until smooth. Set aside.
Combine chicken and rosemary in a large bowl, and toss well. Spread 1/3 cup bean mixture evenly over each crust, leaving a 1/4-inch border. Top each crust with 1/2 cup chicken, 1/3 cup spinach, and 1/4 cup cheese.
Place pizzas directly on oven rack, and bake at 450° for 8 minutes or until crusts are golden.