Heat a large skillet over medium heat. Brown the ground beef until no pink remains, then drain any excess fat.
Transfer the cooked beef to your 6-quart slow cooker.
Add the prepared vegetables (carrots, bell pepper, scallions) to the slow cooker.
In a separate bowl, create the sauce by whisking together minced garlic, soy sauce, brown sugar, and stock.
Pour the sauce mixture over the ingredients in the slow cooker and stir to combine.
Cover and cook on low for 4-6 hours.
During the final 30 minutes, add the dry ramen noodles (discard seasoning packets).
Stir occasionally until noodles are tender.
Serve hot, garnished with additional scallions and sesame seeds.