Curried Creamy Sweet Potato Soup

Bring water to a boil in large saucepan over high heat. Add potatoes; return to a boil. Reduce heat to medium-low and simmer, uncovered, 15 minutes or until potatoes are tender.

Meanwhile, heat medium nonstick skillet over medium-high heat until hot. Coat with nonstick cooking spray; add 1 teaspoon butter and tilt skillet to coat bottom. Add onions; cook 8 minutes or until tender and golden.

Drain potatoes; place in blender with onions, 1 cup milk, curry powder, salt and ground red pepper. Blend until completely smooth. Return potato mixture to saucepan and stir in remaining 1 cup milk. Cook 5 minutes over medium-high heat or until heated through. Remove from heat and stir in remaining 1 tablespoon butter.