Bring a large pot of salted water to a steady boil.
Add the noodles and cook them according to the package directions until they reach an al dente texture.
Drain the cooked noodles thoroughly and place them aside.
Season the chicken pieces with salt, black pepper, and paprika.
Warm 1 tablespoon of the butter in a large skillet over medium-high heat.
Place the chicken in the skillet and cook for 5 to 7 minutes, stirring as needed, until the pieces are golden on the outside and cooked through.
Transfer the chicken from the skillet to a separate plate and set it aside.
Melt the remaining butter in the same skillet.
Add the diced onion and minced garlic, then sauté for 2 to 3 minutes, or until softened and fragrant.
Sprinkle the flour into the skillet and whisk continuously for 1 minute.
Gradually pour in the chicken broth while whisking to keep the sauce smooth and free of lumps.
Stir in the heavy cream, shredded cheddar cheese, and dried thyme.
Cook the sauce for 3 to 4 minutes, stirring occasionally, until it becomes thick and creamy.
Season the sauce with additional salt and black pepper to taste.
Return the cooked chicken to the skillet, then add the drained noodles.
Stir until the chicken and noodles are fully coated in the creamy sauce and warmed through.
Finish with chopped fresh parsley, if using.
Serve hot as a rich and comforting meal.