Preheat oven to 190ºC fan bake and line a large oven tray with baking paper.
Grate onion and place in a large bowl with the breadcrumbs. Stir to combine and leave for 5 minutes.
Add beef mince, pork mince, egg, Worcestershire sauce, crumbled stock cube, garlic powder, herbs, salt and pepper to breadcrumbs. Mix until well combined (you might find it easiest to use your hands).
Shape mixture into meatballs (about 1 1/2 tablespoons mixture per meatball). Flatten into disks, place a dollop of cream cheese in the centre and shape the mince mixture around the cream cheese to enclose well.
Place on prepared tray and bake for 20 minutes, until meatballs have browned and are cooked through. Skewer with cocktail sticks to serve.