Using a fork or a sturdy whisk, blend together the butter, blue cheese, olive oil, sea salt and pepper until thoroughly combined. Add the flour, a little at a time, until fully incorporated. Don’t overmix. the dough is ready when it is not sticky but smooth, and pulls away cleanly from the sides of the bowl. Shape into a ball and wrap in plastic wrap. Chill in the refrigerator at least 20 minutes.