Cut salmon into bite sized pieces and add to a mixing bowl.
Next, add red pepper flakes, ginger powder, salt, hoisin, soy sauce, and sesame oil to the salmon and toss to coat. marinade for up to 1 to 3 hours.
Cut each nori sheet into quarters using kitchen scissors.
Lightly spray muffin tin with nonstick spray. Preheat the oven to 350 degrees F.
Place nori pieces onto a flat surface. Add a spoonful of sushi rice into the center of each nori sheet and press down into the muffin tins.
Top each muffin tin with a spoonful of marinated salmon.
Place into the oven on the center rack and bake for 15 minutes.
Prepare spicy sriracha mayo. Combine all ingredients in a small bowl and whisk until smooth.
Add cucumber and carrots on top each sushi muffin and drizzle with spicy mayo.
Garnish with scallions and sesame seeds.
Notes
Perfectly cooked fish: Don't overcook the salmon, otherwise it will dry out. Sesame seed garnish: Toast the sesame seeds first (in a dry skillet, shaking often) to really bring out their flavor. Making sushi rice: Follow the instructions on the package, as brands can vary.