01 -
Add ground meat to a large bowl. Mix together panko breadcrumbs and half and half and let soak for 5 minutes. Add soaked breadcrumbs, egg, and seasonings to ground meat mix, and gently mix by hand until just combined.
02 -
Heat 1 tablespoon of butter or olive oil in a skillet or multi-cooker. Form the meat mixture into ping-pong-sized balls and place them in a single layer on the skillet or multi-cooker. Brown meatballs on each side for about 2 minutes, then transfer to the slow cooker.
03 -
Add beef broth to the slow cooker, cover, and cook on low for 6 hours or high for 3 hours.
04 -
Heat the remaining 4 tablespoons of butter in a skillet. Whisk in flour until smooth. Slowly pour in the broth from the slow cooker, whisking continuously. Add blackberry preserves and sour cream, and simmer while whisking until the sauce thickens (about 5 minutes).
05 -
Prepare the noodles according to package directions.
06 -
Serve the meatballs with the sauce over the cooked noodles. Garnish with parsley if desired.