You need
Oil or butter
Red curry paste
Chili flakes
Coconut milk (normal, not light. Let it set in the refrigerator)
Peanut butter
What you do (serves at least two):
Heat up a pan with some oil or butter. When hot, put in 3,5 teaspoons of the curry and chili flakes. Fry it for a minute or two, then, add the box of coconut milk and about 3 tablespoons of peanut butter. Heat everything. Depending on what you like, add more chili or more peanut butter. If you have unsalted peanut butter you might need to add salt or soy sauce as well.
Enjoy!