I had to stop by @erikah, meatballs and mash are one of my all-time favourite comfort foods, but I've only ever fried them, much healthier and less splattering, so I'll be trying that method next time.
Nothing wrong with being indulgent now and then though, the sauce sounds so good. Sour cream is much better when it comes to savoury dishes.
You gave me a good chuckle with this:

... (make sure it's good quality and not brick powder)

Have a great week further.