01 - Line two large baking sheets with parchment paper or silicone mats.
02 - In a heavy-bottomed saucepan over medium heat, combine granulated sugar, brown sugar, heavy cream, and butter. Stir constantly until butter melts and mixture comes to a boil.
03 - Attach a candy thermometer to the pan. Continue stirring and cook until mixture reaches 238°F (soft ball stage), approximately 8 to 10 minutes.
04 - Remove pan from heat. Add vanilla extract and salt. Stir in pecan halves.
05 - Beat mixture vigorously with a wooden spoon for 2 to 3 minutes until it thickens and becomes creamy but still pourable.
06 - Quickly drop heaping tablespoons of praline mixture onto prepared baking sheets, spacing them apart.
07 - Allow pralines to cool and set at room temperature for approximately 30 minutes.
08 - Once hardened, transfer to an airtight container and store at room temperature for up to one week.