1.Preheat oven to 180ºC. Line a 12-hole muffin pan with paper patty cases. In a large bowl, combine flour, sugar and chocolate chips, stirring well.
2.Heat milk and butter together in a small saucepan on medium until butter has melted. Allow to cool. Add egg and vanilla, whisking to combine. Make a well in the centre of the flour mixture and pour in the milk mixture. Stir until just combined.
3.Lightly fold caramel through. Divide mixture between patty cases. Bake for 20-25 minutes or until skewer inserted into the centre comes out clean and dry. Cool in pan for 5 minutes. Transfer to a wire rack to cool completely.