Make the sauce by whisking maple syrup, coconut aminos, rice vinegar, sesame oil, and red pepper flakes. Add arrowroot powder and whisk until combined.
Heat olive oil in a skillet over medium-high heat. Add ground beef and cook until no longer pink, about 5 minutes.
Add garlic and ginger, cooking until fragrant, about 1-2 minutes.
Add bell pepper and carrots, cooking until tender, about 3-4 minutes.
Pour sauce over skillet contents, stir, and simmer until thickened, about 2-3 minutes. Season with salt and pepper.
Stir in green onions and spoon filling into lettuce wraps. Garnish with sesame seeds.
Notes
For added flavor, serve with steamed rice or sautéed cauliflower rice.