3 tablespoons olive oil
1 teaspoon ground cayenne pepper
1 medium yellow onion, chopped
2 tablespoons yellow curry powder
2 (14 ounce) cans vegetable broth
3 large Yukon Gold potatoes, chopped
2 (10 ounce) packages frozen cooked yellow squash
1/2 head cauliflower, chopped into bite size pieces
2 (15 ounce) cans garbanzo beans
1 (8 ounce) container plain yogurt
cilantro leaves, for garnish