Yes, LEAVENED is a Scrabble word!

Letter values in Scrabble US: L 1, E 1, A 1, V 4, E 1, N 1, E 1, D 2.

Is it a valid word?

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

made light by aerating, as with yeast or baking powder; often used as a combining form