Add the miso, chicken base, chili-garlic sauce and ginger to the bottom of a lidded 16-ounce heat-safe container. Top with the rice vermicelli, chicken, mushrooms, peas and scallions. Secure the lid and refrigerate until using, up to overnight.
When ready to eat, add 1 1/4 cups boiling water to the container, cover and let sit until the noodles soften, about 7 minutes. Uncover and stir to dissolve the miso.
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