Preheat oven to 350°F and line an 8x8-inch baking pan with parchment paper.
Mix together flour, softened butter, and sugar until a dough forms, then press evenly into the prepared pan and bake for 18-20 minutes until lightly golden.
Let the shortbread cool completely, then spread the dulce de leche evenly over the top and refrigerate for 30 minutes.
Melt the chocolate chips in the microwave, stirring every 30 seconds until smooth, then pour over the caramel layer and spread to cover.
Refrigerate for at least 1 hour until chocolate is firm, then lift out using the parchment paper and cut into 16 squares.