This is how I make meatballs:
In food processor, blitz together 4 large shallots, chilli (optional), 2-4 garlic cloves, 1 pepper. Scrape it down the sides of the bowl, and then add your mince (450-500g). If you have bought lean mince, add a good slug of olive oil/coconut oil. Season well with salt and black pepper, and some dried oregano. (You need a bit more salt than you think you will). Blitz again, till it's all well mixed together.
Tip the mixture on to a chopping board and roll it into large walnut-sized balls.
Put these into an oven dish and bake in a hot oven for around 20 minutes, turning them over half way through the cooking time.
Guaranteed not to fall apart if you do them this way!