01 -
In a large mixing bowl, combine panko breadcrumbs and whole milk until moistened. Add ground beef, diced onion, egg, and beefy onion soup mix; mix thoroughly until uniform.
02 -
Shape the mixture into approximately 18 evenly sized meatballs.
03 -
Heat a skillet over medium-high heat and sear meatballs for 1 to 2 minutes per side until they develop a browned crust.
04 -
In the crockpot, whisk together beef broth, tomato paste, and soy sauce. Add seared meatballs, diced potatoes, baby carrots, and remaining onions.
05 -
Cover and cook on low for 7 to 8 hours or on high for 4 to 5 hours until meatballs are cooked through and vegetables are tender.
06 -
If a thicker sauce is desired, mix cornstarch with cold water and stir into crockpot during the last 30 minutes of cooking.