Add ground beef to a 12-inch skillet over medium-high heat and crumble with a wooden spoon. Add green onions and season with salt, pepper, garlic powder, sriracha, and soy sauce. Cook 6-8 minutes until fully browned with no pink remaining. Transfer to a plate.
Add avocado oil to the same skillet over medium-high heat for 30 seconds. Add shredded brussels sprouts, season with salt and pepper, and spread in an even layer. Let sit undisturbed 2-3 minutes, then stir and cook another 5-7 minutes until tender with caramelized edges.
Return cooked beef to skillet with brussels sprouts. Pour in sweet chili sauce and lime juice. Stir well to coat everything and cook 1-2 minutes until heated through and glossy.
Remove from heat, sprinkle with sesame seeds if desired, and serve immediately over rice or your preferred base.
Notes
Use lean ground beef (90/10 or 93/7) to avoid excess grease. Ground turkey or chicken work as substitutes.
Pre-shredded brussels sprouts save significant prep time. If using whole sprouts, halve them and increase cooking time to 10-12 minutes.
Always use low sodium soy sauce to control saltiness. Use tamari for gluten-free option.
Can be made ahead and reheated. Stores in airtight container for up to 4 days. Not recommended for freezing as brussels sprouts become mushy.