Step 1: Season the chicken
Place the chopped chicken breasts in a large bowl.
Sprinkle with salt, black pepper, paprika, and dried oregano.
Toss until all the chicken pieces are evenly coated with the seasonings.
Step 2: Cook the chicken
Heat the oil in a large, deep frying pan over medium heat.
Add the seasoned chicken and cook for 5–6 minutes, turning frequently, until golden and cooked through.
The chicken should reach an internal temperature of 165°F (74°C).
Transfer the cooked chicken to a bowl and set aside.
Step 3: Sauté the onion
Add the butter to the same pan and allow it to melt.
Add the sliced onion and cook gently for 2–3 minutes, stirring frequently, until it begins to soften and turn translucent.
Scrape the bottom of the pan as you stir to release the flavorful browned bits left behind by the chicken.
Step 4: Add the garlic and parsley
Stir in the minced garlic and dried or fresh parsley.
Cook for approximately 1 minute, stirring continuously, until the garlic becomes fragrant.
Avoid allowing the garlic to brown too much.
Step 5: Add the chicken stock
Pour the chicken stock into the pan and stir well.
Bring the liquid to a gentle simmer.
Step 6: Cook the spaghetti
Add the dried spaghetti directly to the simmering stock.
Make sure the pasta is submerged in the liquid. Allow it to soften slightly before gently pressing it into the stock if necessary.
Cover the pan with a lid or foil.
Simmer gently for 10–12 minutes, stirring occasionally to prevent the spaghetti from sticking together.
Cook until the pasta is almost tender.
Step 7: Make the creamy sauce
Stir the heavy cream and grated Parmesan-style cheese into the pasta.
Mix gently until the cheese melts and combines with the stock to create a creamy sauce.
Step 8: Return the chicken
Add the cooked chicken and any accumulated juices back to the pan.
Cook for another 2–3 minutes, stirring occasionally, until the chicken is thoroughly heated and the spaghetti reaches your preferred tenderness.
Step 9: Finish and serve
Divide the Garlic Butter Chicken Pasta between serving bowls.
Top with additional grated Parmesan-style cheese, finely chopped parsley, and freshly ground black pepper.
Serve immediately while the pasta is warm and creamy.