this beautiful tumblr post.

• 1 tbsp butter (~15 g)
• 2 tbsp sugar
• 1 pinch salt
• A couple of drops of vanilla extract
• 1 egg
• 4 tbsp plain flour (or, see variants)
• Choc chips

1. Melt butter in a mug. Let it cool a little before adding everything else.
   
   1 tbsp (about 15 g) butter
   
2. Mix in:
   
   2 tbsp sugar
   a pinch of salt
   a couple of drops of vanilla extract
   1 egg
   
3. Mix in flour. Do not overmix; should be Just combined.
   
   4 tbsp plain flour
4. Add as many chocolate chips as possible / desired / necessary
   
   Chocolate chips
5. Microwave till done..?
   • Original suggests 40-60 sec
   • On my old 700W microwave it was like 1 min 25
   • On my current 900W microwave it's 1 min
6. Once it's out of the microwave, let it continue to cook for a minute or so. Then eat

• Great with cream or ice cream.
• Original recipe asks for only the egg yolk, but you can just put the whole thing in it's fine
• Better with butter, marg... also works.
• White sugar is fine. 1 tbsp caster/white and 1 tbsp brown sugar (light or brown) is even better

• For a chocolate cookie, substitute 1 tbsp of flour with 1 tbsp cocoa powder.
• Optionally, loosely mix in melted Nutella with or instead of chocolate chips
• Original suggests adding anything you can find instead of (or as well as?) choc chips - marshmallows, oreo pieces, smarties, etc.