Start by cooking the pasta according to package instructions in a large pot of salted water. Then in a large plate mix the paprika, cayenne pepper, ground cumin, dried thyme, salt and onion powder, set aside till needed.
While the pasta is boiling, cut the chicken breasts in half lengthwise then coat them in the spice mix.
Heat the olive oil in a large pan and cook the seasoned chicken over medium heat until done all the way through, which will take approximately 5-7 minutes depending on the thickness of the pieces. Remove to a separate plate.
Lower the heat to low and wipe the pan clean with a paper towel. Add the butter and let it melt add the double/heavy cream and let it heat for about 5 minutes, then stir in the grated Parmesan and allow the cheese to melt slowly into the sauce, continue stirring until the sauce comes together, then sprinkle with nutmeg and take it off the heat.
Drain the pasta and reserve 125ml/½ cup of the pasta water, add the pasta to the pan with the sauce and toss gently to coat, season with salt to taste, add a splash of the reserved pasta water to loosen the sauce if it gets too thick. Top with the sliced blackened chicken and serve.