Slow Cooker Mongolian Beef is not only insanely easy to make, it's also completely gluten free! Slices of beef slow cooked in a sweet and savory sauce with hints of garlic and ginger, and a handful of green onions. Serve over jasmine rice for a dinner your whole family will love!
Add flank steak to plastic ziplock bag with corn starch. Shake to coat steak. Pour steak into slow cooker.
In a medium bowl whisk together brown sugar, water, soy sauce, sesame oil, garlic powder, and ginger powder. Pour over steak.
Cook on HIGH for 3 1/2 hours, or LOW 7 1/2 hours. Add green onions and cook an additional 1/2 hour. Stir together and serve.