Stir oil, salt and pepper together in a large bowl. Add cauliflower slices and gently toss to coat. Transfer to a large rimmed baking sheet and roast until tender, 10 to 14 minutes. Top with cheese, return to the oven and roast until the cheese has melted, 1 to 2 minutes. Top each cauliflower slice with a dollop of sour cream and sprinkle with bacon and scallion greens.
90 calories;7 g fat(3 g sat); 1 g fiber; 4 g carbohydrates; 4 g protein; 42 mcg folate; 14 mg cholesterol; 2 g sugars; 0 g added sugars; 147 IU vitamin A; 33 mg vitamin C; 74 mg calcium; 0 mg iron; 193 mg sodium; 239 mg potassium