Heat oven to 350 degrees and grease a 9-inch square baking pan.
In a large bowl whisk together brown sugar and butter.
Add eggs and vanilla extract and whisk until incorporated.
Add flour, baking powder, and salt and use a wooden spoon to fold into mixture until no flour is visible. Stir in chocolate chips and pecans. Pour batter into prepared pan.
Bake 35-38 minutes. Let cool before slicing.
To make Caramel-Bourbon Sauce, heat brown sugar, butter, heavy cream, and bourbon in a small pan. Bring to a boil and whisk for 1 minute. Remove from heat. Pour into a bowl and refrigerate for about 1 hour.
To serve, cut blondies into squares. Top with a scoop of vanilla ice cream and Caramel-Bourbon Sauce.