Place pizza crust on baking sheet. Combine ricotta, dressing, Parmesan and ground red pepper; spread onto pizza crust to within 1/2 inch of edge. Bake 5 min.
Meanwhile, microwave spinach in microwaveable bowl on HIGH 3 min. Add chicken, bell peppers, lemon zest, tarragon and garlic; mix well. Microwave 1 min.; stir.
Spread spinach mixture over pizza; top with blue cheese and olives.
Bake 5 min. or until pizza is heated through and edge of crust is lightly browned. Sprinkle with parsley.