This is a great after-school snack. Feel free to add nuts or other things instead of chocolate chips.
Mix melted butter, white sugar, brown sugar, and vanilla together in a microwave-safe mug; add flour, baking powder, and salt and mix thoroughly. Stir chocolate chips into the doughy mixture until just combined.
Cook in microwave oven until cookie-like, about 1 minute.
Per Serving: 471 calories; protein 3.9g; carbohydrates 56.8g; fat 26.5g; cholesterol 61.1mg; sodium 756.3mg.