Strain tomatoes, reserving liquid. Cook pasta according to package directions; drain well. In large microwave-safe bowl, combine 2 tablespoons reserved liquid with cheese. Microwave at HIGH (100 %) 2-3 minutes, stirring occasionally, until cheese melts and mixture is smooth.
Gradually blend in 1/3 cup reserved liquid. Add pasta, tomatoes, and remaining ingredients; toss. Cover and chill, stirring occasionally. Serve on lettuce, if desired. Makes 6 to 8 servings.
If you like it hotter, use the hot Mexican Velveeta.