While pasta is simmering, set a frying pan over medium heat. Add and melt 1 tablespoon butter or oil. Saute finely chopped onion and peppers until onion is translucent.
Add broccoli and greens and cover pan. Reduce heat to low and cook until greens are wilted and broccoli is tender.
When macaroni and cheese is done, stir in beef, to taste.
EASY VERSION: Skip the onion and peppers. Instead, toss greens directly into the macaroni as it boils and then simmers, cooking both simultaneously. Steam broccoli separately (to prevent overcooking). When Macaroni and cheese is done, stir in broccoli and beef until it’s one messy, cheesy, conglomerate of glorious, one-pot meal.
The One with All Three https://www.cheapskatecook.com/modified-macaroni-cheese-4-ways/