Boil and mash the potatoes. Fry the onion until brown in 1T olive oil and then add to the potatoes. Boil cabbage in salted water until just cooked. Drain and add to the potato mixture along with the bacon. Season with salt and pepper.
Heat olive oil in a large skillet. Shape the bubble and squeak mixture into large balls, place in the hot oil, flatten down with a spatula to make pancake-like shapes. Cook until golden brown, turn, repeat for the other side. Serve immediately with minced chives.
This classic dish originally contained beef along with the left over cooked potatoes and cabbage. The name is apparently due to the sounds that are emitted during the cooking, the vegetables bubble as they are boiled then squeak in the frying pan.