Pasilla chilies are dried chilaca chili peppers, but the name is often mistakenly used for poblano peppers, which are called ancho chilies when dried. Pasillas are about 6-8 inches long with dark red-brown, wrinkly skin. They have a mild to medium heat, at about 1,000 to 2,500 Scoville units, with hints of chocolate or raisin flavors.