Preheat oven to 210 degrees celsius (fan forced).
Lightly spray a non-stick mini-muffin tray with cooking spray and set aside (if you don't have a mini-muffin tray, lightly spray a non-stick baking tray).
Place the turkey mince, panko crumbs, garlic, ginger, soy, spring onions, egg, sesame oil and salt and pepper into a bowl. Mix to combine.If using a Thermomix: Place all ingredients into the Thermomix bowl and mix for 5 seconds, Speed 4. Scrape down the sides of the bowl and repeat for another 5 seconds or until combined. Roll mixture into heaped tablespoon sized balls using wet hands (see Notes)
Place one ball into each hole of the mini-muffin tin.
Bake in the oven for 17 minutes.
When the meatballs are almost cooked, place the sauce ingredients (except for the spring onions and sesame seeds) into a microwave-safe bowl. Mix together and then heat in the microwave in 30 seconds bursts for 2-3 minutes (or until slightly thickened and the sugar has dissolved), stirring at each interval.
Add the meatballs to the sauce bowl and toss to coat.
Serve immediately with the extra spring onions and sesame seeds.