Set the spaghetti cooking in a pot of boiling water.
Finely cut the garlic, parsley and the chillis. Slice the capsicum and dice the bacon.
Fry the bacon, then set aside. Drain the pot, the heat the oil on medium and gently fry the garlic, chilli and capsicum. Once the capsicum is soft remove it from the heat and set aside. Do not throw out the oil as this will flavour the dish.
Once the spaghetti is cooked, drain. Pour some of the flavoured oil into the spaghetti pot, then return the spaghetti to the pot. Mix the garlic, chilli, capsicum, bacon and parsley through the spaghetti. Season with salt and pepper if desired.
Serve with freshly grated parmesan cheese.