Preheat oven to 450. Brush a 13x9 in. baking dish with 1 tbsp olive oil. Heat remaining 1 tbsp olive oil in a large skillet over medium heat. Add the onions, bacon and saute, stirring frequently until golden brown (about 10 minutes).

Using a slotted spoon, transfer onions and bacon from the pan to a small plate. Let cool.

Combine bacon, onions and the rest of the ingredients in a large bowl and mix by hand until thoroughly mixed.

Roll the mixture into 24 balls, making sure to pack the meat firmly. Place the balls in the prepared baking dish, and roast until cooked through, 18 to 20 minutes.

Allow the meatballs to cool for 5 minutes before serving.