Slow Cooker, Easy Baked Potato Soup

10 red potatoes

cut into cubes

3 tablespoons all-purpose flour

¾ cup real bacon bits

1 small red onion

chopped

1 clove garlic

minced

2 tablespoons chicken bouillon granules

1 tablespoon ranch dressing mix

2 teaspoons dried parsley

1 teaspoon seasoned salt

½ teaspoon ground black pepper

3 cups water

1 cup half-and-half

½ cup shredded Cheddar cheese

or to taste

¼ cup chopped green onion

or to taste