Preheat your grill and allow it to get to roughly 450 degrees F.
On the stove, brown the ground beef and drain as needed. Season to taste with salt, pepper and garlic.
In a small sauce pan, cook the quinoa per package. Add salt, pepper and garlic to taste.
Cut the tops off of the peppers and clean out the insides.
Use aluminum foil to make a ring around the peppers that will allow them to stand up on the grill.
Mix the black beans and corn mix together in a medium bowl.
After the quinoa has fully cooked, mix it together with the black beans and corn.
Fill the peppers with the ground beef and quinoa, black bean and corn mix.
After the peppers are filled to the top with the mixture, top with shredded cheddar if desired.
Put the peppers on the grill and cook for about 30 minutes.
Remove from grill. Allow to cool for 5 minutes and enjoy!