For clarity, I used decaf powdered tea as that was the only kind I could find at the supermarket. But caffeine does not bother me one way or the other, anyway! So, the final recipe - which you can feel free to alter in terms of spices and quantity of them you prefer - I know some people don't like clove, for example, is as following:

2 cups confectioner's sugar
2 1/2 cups unsweetened powdered instant tea
1 1/2 cup packed brown sugar
2 cups nonfat dry milk powder
3 teaspoons ground cinnamon
1 teaspoons ground nutmeg
2 teaspoons ground cardamom
1 teaspoons ground cloves
1 teaspoon ginger

Put it all in a mixer or food processor, whirl together.

To serve, use 1/4 cup of the mix for one mug of hot water, add milk or cream or whatever your preference if you want it creamier.

It makes at least 15 mugs worth, which is great!