In a medium bowl, combine soy sauce, brown sugar, rice vinegar, garlic, sweet chili sauce, and sriracha. Pour into slow cooker.
Add short ribs and stir to combine. Cook on high for 5 to 6 hours or on low for 7 to 8 hours until meat is tender.
Remove meat from slow cooker and pour cooking juices into a medium skillet.
In a small bowl, combine the cornstarch with 1 Tbsp water until smooth. Add to cooking juices in skillet and bring mixture to a boil over medium-high heat, stirring constantly, until thickened.
Serve short ribs over rice and drizzle with sauce. Sprinkle with scallions and toasted sesame seeds. Enjoy!
Recipe by Simple, Sweet & Savory at https://www.simplesweetsavory.com/slow-cooker-asian-short-ribs/