This salad is a hearty main dish meal. The vinaigrette, with little oil, has few calories while allowing the flavors of the salad to come through.
In a large saucepan, cook the tortellini according to package directions, except omit oil and salt; drain. Rinse with cold water; drain.
In a large bowl, combine tortellini, mixed greens, mushrooms, sweet pepper, and basil.
For dressing, in a screw-top jar, combine white wine vinegar, water, oil, sugar, garlic, and black pepper. Cover and shake well. Pour over tortellini mixture; toss to coat.
Divide the tortellini mixture among four serving bowls or plates. Top with the croutons. Makes 4 main-dish servings.