Please choose the correct solution to the question: To mix the ingredients for chocolate chip cookie in a mug

Solution1: Add 1 tbsp each of melted butter, brown sugar, white sugar, and 1 egg yolk into the mug. Mix  with a spoon and then add 3 tbsp of flour and chocolate chips. Mix again using the spoon.

Solution2: Add 1 tbsp each of melted butter, brown sugar, white sugar, and 1 egg yolk into the mug. Mix  with a spoon and then add 3 tbsp of water and chocolate chips. Mix again using the spoon.

Answer format: solution1/solution2
Answer: solution1