For mashed potatoes
Boil potatoes than mashed heat pan add some butter then add mashed potatoes milk cheese salt and pepper stir nicely to combine all things make a creamy consistency

For fettuccine pasta steak
Boil pasta with salt and drained take a big pan or pot add some olive oil pan fried marinated chicken be sure to cooked both sides

Remove chicken & add some butter in the same pan add onion & garlic stir for 1 min than add chicken broth lemon juice & all spices wait for a boil then add heavy cream now cooked on medium flame for 5 min to became thick than add chicken & pasta mix well