Instant house

This house is very quick.

1 mycelium

1 red mushroom

1 bonemeal

1 door

Dig 3 blocks down.

Place the mycelium.

Place the red mushroom on it.

Use bonemeal on it.

Dig out the pillar in the center.

Dig out 2 blocks in a vertical formation on any side of it.

Place the door in the opening.

Add any improvments you see fit.

Enjoy!