Preheat oven to 450° F.
Cut cauliflower florets into bite-size pieces. Chop rosemary.
In a large bowl, toss cauliflower with remaining ingredients.
Spread seasoned cauliflower on an ungreased baking sheet. Roast for 15 minutes; remove from oven and stir.
Continue roasting for 10 minutes or until cauliflower is tender and lightly browned.