Cut the chicken breast into approx. 2 cm cubes, the chilli pepper into fine rings and the garlic into fine cubes.
Cook the pasta in well-salted water until al dente and drain.
Heat the olive oil in a pan and fry the chicken breast well all over. Then add the garlic, sage and chilli pepper and toss briefly. Add the butter and let it brown very lightly. Season with salt and pepper, add the pasta, stir well and serve sprinkled with grated Parmesan.