Preheat oven to 350ºF and spray two standard size muffin tins with cooking spray (only 3 slots on the second tin).
Cut small pieces of all 4 corners off the wonton wrappers (to make them fit better in the tin and prevent sharp points) and dust any excess flour off. Press a wrapper into each slot.
Spray the top of wrappers with cooking spray and bake for 8-12 minutes until golden brown. Transfer onto a wire rack to cool.
While the wonton wrappers bake, brown the ground chicken in a skillet over medium-high heat. Break apart to fully cook, seasoning with a pinch of salt and black pepper.
While the chicken cooks, mix the bang bang sauce ingredients together in a bowl. Once fully cooked, turn off the heat and add the sauce, stirring everything together.
Fill the wonton cups with the chicken filling and garnish with sliced green onion and sesame seeds, if desired.