
Beat kalamata olives, mascarpone, cream cheese, and olive brine together for a few minutes. (If mixture seems too thick, you can add a bit more mascarpone. You can use it immediately but the flavor is a bit better if you leave in the fridge overnight.)
Put baguette whole in oven for 8 minutes at 375°.
Slice into 1/4”-1/2” slices.
Top slices with a generous amount of olive cream cheese mixture.
Slice castelvetrano olives in half and put on top of cream cheese.
Enjoy!