accordions.scss

@mixin accordion($custom: ()) {

    $options: map-merge((
        panel-bg: #,
        panel-text-color: #
    ), $custom);

    .accordion {
        &__panel {
            background: map-get($options, panel-bg);
            color: map-get($options, panel-text-color);

            &--open {
                ...
            }
        }
        &__title {
            ...
        }
        &__content {
            ...
        }
    }

}