[germanier]

The European Commission is proposed by the (elected) heads of governments and then approved via a democratic vote by the (directly elected) members of the European Parliament. I'd call that a strong democratic mandate.

The European Parliament has the power to reject Commissions they don't see fit and did so in the past.

That's even more power to the members of parliament than in most member states where the head of government can freely appoint ministers without approval of the parliament.