Detox Slow Cooker Loaded Vegetable Soup

Ingredients

1 sweet onion, diced
2 cloves garlic, minced
1 medium sweet potato, peeled and cut into 1 inch cubes
1 pound of small red potatoes, cut into 1 inch cubes
2 carrots, peeled and sliced into 1? pieces
2 stalks celery, diced
1 small bag of frozen peas, carrots, green beans and corn
Kosher or sea salt to taste
Garlic Salt to taste
1/2 teaspoon black pepper
1/8 teaspoon allspice
1/2 teaspoon crushed red pepper flakes (optional)
4 cups of chicken broth (or you can use vegetable broth)
1/4 cup freshly chopped parsley
1 (14.5 oz.) can diced tomatoes