Toss beef with cornstarch, garlic powder & onion powder. Working in rounds, brown in a pan over medium-high heat that has been sprayed with oil. When both sides are browned, about 2-3 minutes per side, transfer to a slow cooker.
Add sesame oil to a small skillet over medium-low heat and add the ginger, scallion whites and garlic, cook 3 to 4 minutes, stirring, until aromatic.
Combine applesauce, soy sauce, rice vinegar, gochujang, sugar, sautéed ginger, scallion and garlic and pour over the beef.
Cook on low setting for 8 hours or high 4 hours, until the beef is fork tender.
Garnish with scallion greens and sesame seeds, drizzle with gochujang or Korean BBQ sauce.
