Preheat your oven to 350 degrees Fahrenheit and line a rimmed baking sheet with parchment paper.

In a large bowl, combine the sugar, corn syrup, melted butter, vanilla extract, and egg; set aside two tablespoons of this mixture, then stir the pecans into the remaining mixture.

Unroll the Pillsbury Crescent rolls and separate them on the prepared baking sheet. Spoon 2-3 tablespoons of the pecan mixture onto each crescent roll and roll them up from the largest end to the smallest.

Bake for 8 minutes, then remove from the oven and brush with the reserved sugar mixture. Return to the oven and bake for an additional 5 minutes, or until lightly browned, then top with more chopped pecans if desired.