During the "For Bella" mission, reach the "Find a way into the Weyland-Yutani Facility to save Bella" objective. Follow the stairs to a door and exit the interior to enter a rocky exterior area with lava flowing down a cliff to your right. Run partway up the path ahead and look to the right across the chasm with a scoped weapon to see a box of donuts. Shoot them and they will disappear. Once done, look to where your teammates are waiting to see a huge donut appear uphill. It will roll down, launch off the cliff, and explode in the lava.