In a matcha mixing bowl or mug, mix matcha, collagen, and just enough hot water to dissolve them (usually an ounce or two).

I make a thick sludge and whisk well until I've gotten all the clumps out.  A bamboo whisk really helps with this but it can be done with a spoon or fork.  The hot water is key for this though.

Using a bamboo whisk, froth the matcha.  (Here's a matcha tool set that helps a lot- the bamboo whisk cuts down on bitterness too!  A barista taught me that!)

In your drinking glass, fill halfway with ice and fill with milk, leaving room at the top for your matcha mix. Pour on top and enjoy!