Preheat oven to 375°F.
In a large skillet, heat 1 teaspoon EVOO over medium-high heat. Add the sausage and oregano and cook, breaking up the sausage with a wooden spoon, until just browned, about 5 minutes. Drain drippings and let cool.
Grease a 9-inch pie pan with the remaining 1/2 teaspoon EVOO. Place 1 piece biscuit dough into a large resealable plastic bag and, using a rolling pin, roll it out into an 1/8-inch-thick disk. Remove the dough from the bag and transfer it to the prepared pie pan. Repeat with the remaining dough pieces, pinching the pieces together in the pan to form a crust.
In a large bowl, combine the cooked sausage, onion, feta and olives; spread mixture evenly over the crust.