sour creamy coleslaw

Ingredients

• 4 cups shredded cabbage (½ head cabbage)
• 1 cup shredded carrot (1 small carrot)
• 1 cup shredded green bell pepper (½ green bell pepper)
• 1 cup whole kernel sweet corn
• FOR DRESSING :
• ½ cup mayonnaise
• 3 tablespoons sour cream
• 2 tablespoons plain yogurt
• 1 tablespoon yellow mustard
• 1 tablespoon cottage cheese
• 1 teaspoon dried minced onion
• ¼ teaspoon celery salt
• ¼ teaspoon roasted garlic powder
• 1 teaspoon sugar, or more to taste
• 1 tablespoon rice vinegar
• ¼ teaspoon black pepper