Easiest way to stir SKIM MILK to avoid lumps

When you put SKIM MILK (SKIMMED MILK) into the mug with coffee or cocoa and add boiling water, it tends to go lumpy, doesn't it ?
Googling the way to avoid lumps, you'll find the way.
It says "warm it gently".
But it takes time.
Don't you think it is annoying ?
So do I.
I found the easiest way to stir SKIM MILK to avoid lumps.

 From the left, "Skim Milk", "Sugar", "Coffee"

Prepared two mugs (including equivalent mount of them)  for comparison.

 

  Validation 1: Add boiling water normally.

Then stir up.

You can see some lumps.

Validation 2: Mix powders before adding boiling water.

Mix powders.

You ready?

 

Ta-Da！！！

You can't see any lumps at all.

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