Potato Salad with Sour Cream

Ingredients

• 6 cups diced cooked potatoes
• 1 cup chopped celery
• 1/2 cup chopped seeded peeled cucumber
• 1/2 cup chopped green pepper
• 1/4 cup sliced green onions
• 6 hard-boiled large eggs
• 1 cup sour cream
• 1/2 cup mayonnaise
• 1 tablespoon prepared mustard
• 4 teaspoons white vinegar
• 1-1/2 teaspoons salt
• 1/2 teaspoon pepper
• 1 teaspoon celery seed, optional