Slow-Cooker Chocolate Chip Cookie

Ingredients

• all-purpose flour
• teaspoon baking soda
• teaspoon kosher salt
• unsalted butter, at room temperature
• dark brown sugar
• granulated sugar
• eggs, at room temperature
• egg yolk, at room temperature
• teaspoon vanilla extract
• roughly chopped bittersweet chocolate
• Flaky sea salt
• Vanilla ice cream, for serving