In a small bowl, whisk together the mayonnaise, sweet chili sauce, and sriracha to create the Bang Bang sauce. Set aside.
In a medium bowl, toss the chicken cubes with paprika, garlic powder, salt, black pepper, and cornstarch until each piece is evenly coated.
Heat the vegetable oil in a large skillet or wok over medium-high heat. Add the seasoned chicken in a single layer and cook for 5–7 minutes, stirring occasionally, until golden brown and cooked through. Remove the chicken from the pan and set aside.
In the same pan, melt the butter. Pour in the beaten eggs and stir gently until they form soft curds. Push the eggs to one side of the pan.
Add the chilled rice and the thawed peas and carrots to the empty side of the pan. Stir-fry for 3–4 minutes, breaking up any rice clumps and mixing the eggs in with the rice and vegetables.
Return the cooked chicken to the pan. Pour in the soy sauce, sesame oil, and about half of the prepared Bang Bang sauce. Stir well to coat everything evenly.
Remove from heat. Drizzle the remaining Bang Bang sauce over the top and garnish with chopped green onions and sesame seeds before serving.