Cover a cookie sheet with wax paper and grease with butter.

Combine sugar, cream, salt and butter in a large microwavable bowl.

Microwave for 3 minutes, add pecans and stir.

Microwave 6 more minutes or until temperature reaches about 240-245, stirring every 3 minutes or so.

Let mixture sit for 1 minute before adding vanilla and stirring.

Continue stirring for 2 more minutes.

Drop heaping tablespoons of mixture onto prepared sheet.