01 - Line a baking sheet with parchment paper and set aside for later use.
02 - In a heavy-bottomed saucepan over medium heat, combine granulated sugar, brown sugar, heavy cream, butter, and salt. Stir constantly until butter melts and mixture comes to a boil.
03 - Attach candy thermometer to pan. Continue cooking, stirring frequently, until mixture reaches 238°F (soft-ball stage), about 8-10 minutes.
04 - Remove from heat and stir in vanilla extract and pecan halves until evenly distributed.
05 - Stir vigorously for 2-3 minutes until mixture thickens and becomes creamy but remains pourable.
06 - Quickly drop spoonfuls of mixture onto prepared baking sheet, spacing apart to prevent merging.
07 - Let pralines cool at room temperature until completely set, approximately 20 minutes.