Using another bowl, combine all ingredients for the kani and mango mixture.
Place a cut nori sheet on each cavity of the muffin pan. Add 3-4 tbsp (I used a regular-sized ice cream scooper) of cooked sushi rice on the nori sheet and press down the rice.
Top each rice with furikake/crushed nori sheets, and then the kani and mango mixture.
Bake in a 400 F preheated oven for 15-20 minutes.
When the time of baking is up, carefully remove the sushi cups and transfer them to a plate.
Top each sushi cup with mayo, sriracha, and furikake/crushed nori sheets.