In a large bowl, beat together the melted butter, brown sugar, and 3/4 cup sugar. Mix in the vanilla extract, egg, egg yolk, and coffee.
Slowly add in the flour mixture, and stir until completely combined. Stir in the caramel truffles, chocolate chips, and chopped pecans.
Scoop rounded tablespoonfuls of the dough into your hands, and roll into a ball. Place on your baking sheet, and press down each dough ball slightly with the bottom of a glass.