Put the cream into a large bowl, add the breadcrumbs, set aside.
In a large skillet melt the butter and add the chopped onion. Cook for about 3 minutes.
Add the onion, meat, egg, salt, pepper, and nutmeg to the breadcrumbs and cream.
Mix everything together only until well mixed...do not overmix.
In the same skillet as the onion, melt 4 tablespoons of butter on medium heat.
Using two spoons, damp hands, or a small ice cream scoop, form the meat mixture into 1 inch balls and place into the skillet. Leave room around each meatball.
Cook on each side turning to the next side after about 1-2 minutes. Set cooked meatballs into a pan in a low-heat 200 degrees oven while cooking the remaining. Cook meatballs to 165 degrees internally.