Step 1

Line a large baking sheet with parchment paper; set aside.

Step 2

In a medium saucepan stir together the sugars, heavy whipping cream, and the baking soda.

Step 3

Over medium heat bring to a boil stirring occasionally. Allow to boil until a temperature of 235 is reached. Remove from the heat immediately. Stir in the butter and the vanilla. Quickly add the pecans and vigorously stir for about 1 minute.

Step 4

Working quickly, drop by heaping tablespoonfuls onto the prepared cookie sheet.

Step 5

Allow to cool until set.