Cook the spaghetti according to the packet instructions for about 8 to 10 minutes. Reserve the water.
Meanwhile heat the oil a non stick pan and cook the garlic and red pepper (about a minute) add the spinach. Add some of the reserved water from the pasta to cook it through.
Once the spinach has cooked transfer it to the food processor or blender and process into a smooth paste/sauce.
Pour the spinach into the pan with the spaghetti, peppers and garlic and mix on medium heat. Use the remaining reserved water to get it into the consistency you want. Season to taste.
Serve with Parmesan cheese (optional) and a drizzle of olive of oil (not optional!)