In 5-quart Dutch oven, melt butter over medium-high heat. Add onions; cook about 3 minutes or until softened. Add salt, garam masala and curry powder; cook 3 to 5 minutes or until fragrant and brown. Add gingerroot and garlic; cook 1 minute. Add carrots and potatoes; cook 2 minutes. Add broth; simmer about 5 minutes or until potatoes and carrots are softened. Add tomatoes, chick peas and coconut milk; stir to combine.