Preheat oven to 400°F (200°C). Cut nori sheets into four squares.
Toss cubed salmon with sesame oil, soy sauce, honey, scallions, and spices. Marinate 30 minutes.
Place each nori square into a muffin cup. Add 1 tbsp rice to the bottom and press gently.
Add 4–5 marinated salmon cubes on top of each rice layer.
Bake for 15–17 minutes until salmon is cooked and nori edges are crisp. Broil for 1–2 minutes for color.
Mix Kewpie mayo, sriracha, and honey to make spicy mayo.
Drizzle spicy mayo, top with avocado and sesame seeds, and serve.
