Yes, BREADSTUFF is a Scrabble word!

Letter values in Scrabble US: B 3, R 1, E 1, A 1, D 2, S 1, T 1, U 1, F 4, F 4.

Is it a valid word?

BREADSTUFF is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

food made from dough of flour or meal and usually raised with yeast or baking powder and then baked
flour or meal or grain used in baking bread

Also: staff of life.