Bring a pot of salted water to a boil. Cook the penne pasta according to package instructions until al dente. Reserve 1/2 cup of pasta water before draining. Set the pasta aside
In a small bowl, combine garlic powder, paprika powder, salt, black pepper, and cumin powder. Rub the spice mixture evenly onto both sides of the chicken breasts.
Heat 2-3 tbsp of oil in a skillet over medium heat. Sear the chicken breasts for 5-6 minutes per side, or until fully cooked. Add the unsalted butter to the skillet during the last minute of cooking, allowing it to melt and coat the chicken.
Remove the chicken from the skillet and let it rest for 10 minutes before slicing into thin strips.
In the same skillet, add the garlic paste and tomato paste. Stir constantly over medium heat for 1-2 minutes, allowing the flavors to develop.
Pour in the chicken broth (or water with a chicken stock cube)and bring to a simmer. Let the mixture cook for 2-3 minutes to reduce slightly.
Stir in the heavy whipping cream and bring to a simmer again. Lower the heat and cook for 5-6 minutes, stirring occasionally, until the sauce thickens.
Stir in the Parmesan cheese, freshly chopped parsley, garlic powder, Italian seasoning, salt, and lemon juice. Continue to cook for 1-2 minutes, ensuring the sauce is smooth and well combined.
Add the cooked pasta to the skillet and toss to coat in the creamy sauce. If the sauce seems too thick, add a bit of there served pasta water to reach your desired consistency.
Gently stir in the sliced chicken and diced bell peppers. Mix until everything is well combined and heated through.
Serve hot, garnished with additional parsley and freshly grated Parmesan cheese, if desired.