Scrub the potatoes and make slits in them.
Place the steamer in the saucepan and fill it with water.
Turn the broccoli crowns into trees using kitchen shears.
Add the broccoli to the steamer.
Scoop out the cooked potatoes to form slippers.
Mash the potato with cheddar.
Add the steamed broccoli trees to the potatoes.
Sprinkle the potatoes with Jack cheese.