Prepare your boxed brownie mix according to box instructions, then set aside to cool.
In a saucepan over medium heat, combine brown sugar, light corn syrup, butter, an egg, and vanilla extract.
Bring the mixture to a boil, then continue to boil for 1 minute, stirring continuously. Add in 1 ¼ cups pecan pieces, then set aside to cool completely.
Cut any hard edges off the brownies and discard (or save for snacking on later), then crumble up the remaining brownie with a fork and add it to a mixing bowl along with softened cream cheese.
Using an electric mixer, mix until the brownie forms a batter consistency and there is so visible cream cheese remaining.
Line a baking sheet with parchment paper or a silicone mat, then roll the brownie mixture into balls roughly 1.5 inches in size and place on your prepared baking sheet.
Working one by one, flatten out a brownie ball and place roughly 1 tsp of cooled pecan filling in the center. Wrap the brownie mixture around it to seal, then return to the baking sheet.
In a microwave safe bowl, combine chocolate chips and vegetable oil. Microwave in 30 second intervals, stirring in-between, until melted and smooth.
Coat each stuffed brownie ball in the melted chocolate, let any excess chocolate run off, then return to your prepared baking sheet.
Immediately top each one with chopped pecans, then transfer to the fridge to set the chocolate coating before enjoying!