Preheat oven to 350F. Stir together brownie mix , vegetable oil and eggs until well combined. For easier handling refrigerate cookie dough and dulce de leche for at least 1/2 an hour.

Place a spoonful of cookie batter onto a lined cookie sheet. Flatten and place 1 teaspoon of dulce de leche on top and top with another spoonful of cookie batter. Press down a little on the sides.

Bake cookies for 9-14 minutes until edges are set. Shorter time makes chewier cookies. I went for crispy and baked for closer to 14 min.

Cool cookies on sheet for a few minutes, then transfer to wire rack until fully cooled.