In a small bowl, whisk together brown sugar, reduced sodium soy sauce, sesame oil, crushed red-pepper flakes, and ground ginger.

Heat vegetable oil in a large cast iron skillet over medium-high heat. Add minced garlic and cook for about 1 minute until fragrant.

Add the ground beef to the skillet, crumbling it as it cooks. Brown for about 3-5 minutes until fully cooked.

Pour in your sauce mixture along with chopped green onions. Stir to combine all flavors and let simmer for an additional 2 minutes.

Serve immediately, garnished with extra green onions and sesame seeds if desired.