Quick Cauliflower Casserole
["1 small cauliflower", "2 (8 oz.) cartons sour cream", "1/2 c. grated Parmesan cheese, divided", "1 Tbsp. plus 1 tsp. all-purpose flour", "1/4 tsp. coarsely ground pepper", "1/8 tsp. salt", "2 Tbsp. minced fresh chives"]
["Remove and discard large outer leaves of cauliflower.", "Break cauliflower into flowerets.", "Arrange flowerets in a steamer rack; place over a small amount of boiling water.", "Cover and steam 4 minutes or just until crisp-tender.", "Transfer flowerets to a lightly greased 1 1/2-quart casserole."]
["cauliflower", "sour cream", "Parmesan cheese", "all-purpose flour", "ground pepper", "salt", "fresh chives"]