Garden Pasta Salad

2 cups whole-wheat rotini (6 ounces)
1/3 cup reduced-fat mayonnaise
1/3 cup low-fat plain yogurt
2 tablespoons extra-virgin olive oil
1 tablespoon red-wine vinegar or lemon juice
1 clove garlic, minced
1/8 teaspoon salt, or to taste
Freshly ground pepper to taste
1 cup cherry or grape tomatoes, halved
1 cup diced yellow or red bell pepper (1 small)
1 cup grated carrots (2-4 carrots)
1/2 cup chopped scallions (4 scallions)
1/2 cup chopped pitted Kalamata olives
1/3 cup slivered fresh basil

1. Bring a large pot of lightly salted water to a boil. Cook pasta, stirring occasionally, until just tender, 8 to 10 minutes, or according to package directions. Drain and refresh under cold running water.
2. Whisk mayonnaise, yogurt, oil, vinegar (or lemon juice), garlic, salt and pepper in a large bowl until smooth. Add the pasta and toss to coat. Add tomatoes, bell pepper, carrots, scallions, olives and basil; toss to coat well.