wp-scss-set-variables.php

<?php
// Create array of variables default colors
$seo_default_colors = array(

	'color-text'	=> '#333333',
	'color-button'  => '#333333',
	'color-link' 	=> '#dddddd',
	'color-white'	=> '#ffffff',
	'color-outline'	=> '#eeeeee',

);

// Update SCSS variables
function seo_set_variables(){
    
    // Get the default colors
    global $seo_default_colors;

    // Create an array of variables
    $variables = array();

    // Loop through each variable and get theme_mod
    foreach( $seo_default_colors as $key => $value ) {

    	$variables[$key] = get_theme_mod( $key, $value );

    }
	return $variables;
    
}
add_filter('wp_scss_variables', 'seo_set_variables');