Yes, BLESSED is a Scrabble word!

Letter values in Scrabble US: B 3, L 1, E 1, S 1, S 1, E 1, D 2.

Is it a valid word?

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

give a benediction to
confer prosperity or happiness on
make the sign of the cross over someone in order to call on God for protection; consecrate
render holy by means of religious rites