Heat olive oil in a large nonstick skillet over medium-high heat. Add sweet potato to pan; saute 3 minutes. Decrease heat to medium. Add cauliflower, onion, and curry powder; cook 1 minute, stirring mixture constantly. Add broth and next 3 ingredients (through tomatoes); bring to a boil. Cover, reduce heat, and simmer 10 minutes or until vegetables are tender, stirring occasionally. Sprinkle with cilantro; serve with yogurt.
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