Sautee the onion. Add garlic, beans and cumin, cover to simmer. Cut 1/2” rounds of yam on an angle. Sprinkle both sides with salt and pepper, then pan fry in olive oil until browned on both sides. Transfer to a baking dish in a 450 oven until fork-soft (~5 min). Add tomato to the beans. Plate the yam rounds attractively, top each with a spoonful of beans, a slice of cheddar, a spoonful of salsa and a dollop of yogurt. Sprinkle with cilantro.