Dig into this vegetarian version of the classic party starter straight from the oven -- the double-cheese, double-chile dip is bubbling and delicious after only 10 minutes.
Preheat broiler with rack 4 inches from heating element. Heat a large ovenproof skillet over medium-high. Swirl in oil. Add poblano and cook, 3 minutes. Add onion and season with salt. Cook until onion is softened and poblano is slightly charred, 4 minutes. Add serrano and cook until softened, 2 minutes more. Remove from heat. Add both cheeses. Broil until bubbly and browned in spots, 2 to 3 minutes. Serve with jicama sticks, radishes, and tortilla chips.