Slice peppers in half lengthwise, discarding the seeds. Set aside.
Prepare mac and cheese according to instructions, stopping at step 4. While this is cooking, gently steam or roast your broccoli until just tender.
Once quinoa and cheese have been mixed, fold in broccoli. Spoon mixture into peppers, place in a large baking dish, and bake for 30 - 35 minutes, until bubbly.
Remove from oven, cool slightly and enjoy immediately.
Notes
These are easily made vegan with the swap of vegan shredded cheese for the goat cheese. Use same measurements and instructions.