Start by placing a large piece of parchment next to the stove, along with a couple of forks. Combine the brown sugar, white sugar, and butter in a large heavy skillet over medium heat. Allow the butter to melt and then stir while the sugars melt and come to a boil.
Add the cream while whisking constantly. When the mixture is smooth again, Add the pecans and stir to coat.
Carefully pour the coated pecans onto the waiting parchment. Working quickly, use the forks to separate the pecans and allow them to cool without clumping together.
Store the completely cooled pralines in an airtight container.