Add jello-O to the boiling water and let dissolve and set aside to cool for 5 to 10 minutes. In a bowl of standing mixer. Add 1 cup of the liquid jell-o and the cream cheese. Beat throughly until smooth, with no lumps. Mixture should have the consistency of pudding. Add 1/4 cup more of the jell-o if the mixture seems to thick. Fold in the thawed Cool Whip. Spread on your favorite cake, especially good on angel food cake. Chill cake in refrigerator for at least 30 minutes and then enjoy!