Combine sugars and next to ingredients in a saucepan.
Bring to a boil over medium heat.
Boil until sugar is dissolved; stir often.
Cover; cook 2 min. to wash down sugar crystals from sides of pan.
Uncover and cook, stirring occasionally, until mixture reaches softball stage 234°F.
Remove from heat; stir in butter and vanilla.
Add pecans.
Beat vigorously with a wooden spoon 2 min. or just until mixture is creamy and begins to thicken. Working rapidly, drop mixture by tablespoonfuls onto prepared waxed paper; let stand until firm.
