Warm the oven up to 177°F (350°C). Spray cooking spray that won't stick on a 10-ounce ramekin and set it away.
Step 2
Melt the butter and add the brown sugar and powdered sugar to a small bowl. Use a whisk to mix the ingredients well.
Step 3
Add the vanilla extract and egg yolk and mix until everything is well mixed.
Step 4
Add the flour, baking soda, and salt and mix just until everything is mixed. Then add the chocolate chips and stir them in slowly.
Step 5
When the dish is ready, put the cookie dough in it and press it down into a flat layer. If you want, you can add more chocolate chips and gently press them down.
Step 6
Put the cookie in the oven at 350°F for 20 to 25 minutes, or until the sides are golden and the top is set.
Step 7
How long you bake it for will depend on how big your bowl is. To avoid cookie top browning, tent with foil. Let it cool down, then serve and enjoy!