Classic Macaroni Salad

For the Dressing:

• 1 cup (240 ml) mayonnaise
• 2 tablespoons (30 ml) sour cream or Greek yogurt
• 1 teaspoon Dijon mustard
• 1 teaspoon garlic powder
• 1 teaspoon sugar
• Salt and pepper to taste
• 1 tablespoon lemon juice or vinegar (for tanginess)