Divide the broccoli into florets. Cook in salted water until just soft, remove, catch 2dl of the cooking liquid.
Cook the penne al dente, drain.
Cut the garlic into small slices, finely chop the chilli pepper.
Heat the butter, fry the garlic until crispy, sauté the peperoncini or chilli peppers briefly. Mix in the broccoli except for a few florets and add the cooking liquid. Simmer briefly, then mash broccoli with a fork. Season with salt and pepper to taste.
Mix in the cheese and penne, warm up briefly, serve.