Tomato-Basil Vinaigrette Salad

1 (14-ounce) can diced tomatoes, drained
1/4 cup packed fresh basil leaves
1 teaspoon garlic powder
1 tablespoon red wine vinegar
2 teaspoons olive oil
4 to 6 cups mixed lettuce greens

In a blender, combine tomatoes, basil, garlic powder, vinegar, and oil. Process until smooth. Season to taste with salt and pepper and serve over greens.