Heat oven to 450. Lightly spray a baking sheet w/ olive oil cookine spray. Place oven rack in lowest position. In bowl, mix together ricotta and parmesan cheeses.
Rinse and dry the broccoli-rabe. Cut into 2"-pieces. In lg skillet, heat oil over medium heat. Cook garlic 1 min. Add broccoli-rabe, salt, rosemary and red pepper flakes. Cook until broccoli-rabe is tender.
Sprinkle mozzarella chees evenly over pizza crust. Spread broccoli-rabe mix over mozzarella cheese. Drop rounded tbsp of ricotta mix over broccoli. Bake 10 mins, or until cheese is melted and crust is lightly browned.