Fill a large pot with salted water and bring to a rolling boil.
Add the pasta and cook until just tender, usually 9 to 11 minutes, then drain while reserving half a cup of the pasta water.
Meanwhile, cut the chicken breasts into thin slices.
Warm the olive oil in a wide skillet over medium-high heat.
Place the chicken strips in the pan, season them with salt, and cook until golden and cooked through, about 4 to 5 minutes each side; then remove from the pan.
Lower the heat to medium, add the minced garlic to the skillet, and cook for about a minute until aromatic, stirring constantly.
Pour in the honey, sprinkle the freshly cracked black pepper and red pepper flakes if using, and cook the sauce for around one minute, stirring to let it thicken and become fragrant.
Put the chicken back into the skillet and stir to cover with the honey pepper sauce.
Add the drained pasta and splash some reserved pasta water to loosen the sauce if necessary, mixing until everything is well coated with a shiny glaze.
Turn off the heat, scatter the chopped parsley over the dish, and toss gently.
Serve immediately, offering grated Parmesan cheese on the side if desired.