In a medium bowl, combine honey, sriracha sauce, garlic powder, paprika, salt, and pepper. Whisk together until well blended to create the marinade.
Place chicken thighs in a baking dish and pour the marinade over them, ensuring they are fully coated. Marinate for at least 30 minutes or up to 2 hours in the refrigerator.
Preheat your oven to 400°F (200°C).
While the chicken is marinating, cook the elbow macaroni according to package instructions until al dente. Drain and set aside.
In a saucepan over medium heat, melt the butter. Stir in the milk, and then slowly add the cheddar cheese, stirring constantly until the cheese is melted and the sauce is creamy. Mix in the cooked macaroni, and season with black pepper and cayenne (if using). Remove from heat.
Place the marinated chicken thighs on a lined baking sheet and bake in the preheated oven for 20-25 minutes or until cooked through (internal temperature of 165°F / 74°C).
Once the chicken is cooked, let it rest for a few minutes before slicing.
To serve, spoon a portion of the creamy mac and cheese onto each plate, top with sliced spicy honey chicken, and garnish with fresh parsley.