Put the glutinous rice flour in a microwave-safe bowl and heat it for 15 seconds, or until the flour becomes warm.
If you lack a microwave, you can use a frying pan instead. Place the glutinous rice flour in the pan and stir-fry it over low heat until it's cooked. You'll notice the color of the flour turning light yellow.
To assemble snow skin mooncakes:
Divide the snow skin dough into 20-gram portions. For a multicolor effect, randomly place your chosen color combinations on the scale (totaling up to 20 grams) and roll the mixture into a ball.
Divide the kinako cream cheese custard filling into 25-gram portions.
Remove the genmaicha lava filling from the mold. Flatten the kinako paste dough, place a piece of lava filling in the center, seal it, and then roll it into a ball. Repeat this step for the remaining ingredients.
Place the kinako paste dough on a plate, cover it with plastic wrap, and refrigerate for at least 30 minutes.
Sprinkle some cooked glutinous flour onto the snow skin dough and flatten it.
Wrap the filling with the snow skin dough, ensuring tight edges.
Lightly coat the mooncake with cooked glutinous rice flour, shaking off any excess.
Sprinkle some cooked glutinous flour onto the mooncake mold.
Put the filled dough into the mold to create a pattern on its surface.
Place the snow skin mooncakes into an airtight container and freeze them overnight.
Before serving, transfer the mooncakes to the fridge for 1 hour to achieve an optimal texture. Alternatively, leave them at room temperature for 10-20 minutes.