Cut the chicken breast into two halves and pound both pieces until thin.
In a bowl, mix black pepper, paprika, garlic powder, salt, chili flakes, and olive oil.
Coat the chicken pieces evenly with the spice mixture.
Heat vegetable oil in a pan over medium heat and cook the chicken for 4-5 mins per side until golden brown.
Remove from the pan, let it rest, then slice into strips.
In a deep pan, melt butter over low heat.
Add flour and whisk continuously for 1 min until fragrant and golden.
Slowly pour in chicken broth and milk, whisking to avoid lumps.
Keep stirring until the sauce thickens and becomes smooth.
Add black pepper, white pepper, chili flakes, and shredded cheddar cheese to the sauce.
Stir well and sprinkle oregano for extra flavor.
Add the boiled pasta to the sauce and mix until fully coated.
If the sauce is too thick, add reserved pasta water gradually to loosen it.
Plate the creamy pasta and top with sliced chicken.
Garnish with extra oregano or chili flakes, and serve hot!