Roasted Sweet Potatoes Topped with Curried Yogurt

Name: Roasted Sweet Potatoes Topped with Curried Yogurt
Yield: Makes 4 Servings
Ingredients: Nonstick vegetable oil spray; 2 8-ounce red-skinned potatoes (yams), halved lengthwise; 1 teaspoon extra-virgin olive oil; 1 teaspoon curry powder; 1 cup plain nonfat yogurt; 1 plum tomato, seeded, chopped; 2 tablespoons chopped fresh cilantro; 2 green onions, chopped