Chocolate Chip Cookie in a Mug

Ingredients

• 1 tablespoon unsalted butter
• 1 tablespoon granulated sugar
• 1 tablespoon light brown sugar
• 1 large egg yolk
• 1/2 teaspoon pure vanilla extract
• 3 tablespoons all-purpose flour
• 2 tablespoons bittersweet chocolate chips
• 1/8 teaspoon kosher salt
• Flaky sea salt

Steps

1. In a 12-ounce mug, melt the butter in a microwave oven. Stir in both sugars along with the egg yolk and vanilla until no streaks of yolk remain. Add the flour, chocolate chips and kosher salt and stir until incorporated.
2. Microwave the cookie at high power for 1 minute, until the top is set and the cookie is slightly pulling away from the side of the mug. Let the cookie cool for 5 minutes.
3. Run a knife around the edge of the cookie and invert it onto a plate. Top the cookie with a pinch of flaky sea salt.