Press your lips together. Air flows through your nose. Vocal cords vibrate.

Americans pronounce mushroom as MUHSH-room (/ˈmʌʃrum/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "My mother made a marvelous mushroom meal" or "The chef made a special fresh mushroom dish" — more examples below.
Record yourself saying "mushroom" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 6 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
Round your lips into a tight circle. Let your tongue rest in the middle of your mouth, slightly raised.
Press your lips together. Air flows through your nose. Vocal cords vibrate.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the first syllable, not the others. Stretch MUHSH — keep everything else short and quick.