Prepare matcha green tea and pink pitaya: Whisk the matcha green tea powder with 1/4 cup of hot water using two separate small bowls. Wisk the pink pitaya powder with 1/4 cup of hot water. Set aside and let it cool down.
Cook the tapioca pearls: Bring a small pot of water to a boil. Add the tapioca pearls to the water and stir until the pearls start to float to the top. Continue cooking them for the amount of time indicated on the packaging. Turn off the heat and carefully drain the boba. Pour the cooked boba into a bowl.
Sweeten the tapioca pearls: Add sweetener and stir the tapioca pearls. Let the pearls sit for about 5 minutes, allowing them to absorb the sweetener, stirring it a few times.
Blend: Add cool matcha with 1 cup milk and 1 cup ice to a blender. Blend on high until no large pieces of ice remain. Repeat with pink pitaya.
Assemble your drinks: Divide the pearls between two glasses. Gently pour in pink pitaya slushy and top with green matcha slush. Enjoy.