Creamy Cucumber and Tomato Salad

2 cucumbers, sliced

2 tomatoes, sliced

¼ onion, chopped

1 cup creamy salad dressing (such as Miracle Whip®), or more to taste

2 tablespoons white sugar, or to taste

salt and ground black pepper to taste

Combine cucumbers, tomatoes, onion, creamy salad dressing, sugar, salt, and black pepper in a salad bowl. If salad seems too sweet, add more salad dressing; if too tart, add more sugar. Chill before serving.