Cheesy Quinoa Black Bean Stuffed Bell Peppers

uncooked quinoa (white or red or both)

Salt

large bell peppers, any color

black beans, drained

 cups grated sharp cheddar cheese, 2 cups for stuffing, 2 cups for topping

to 4 green onions, finely sliced

ground cumin

loosely packed chopped fresh cilantro (optional)