Name: Chocolate Chip Cookie Cake
Prep time: 20 min
Cook time: 25 min
Total time: 2 h
Yield: one 9-inch cake
Ingredients: 3/4 cup (170g) unsalted butter, softened to room temperature; 1 cup (200g) packed light or dark brown sugar; 1 large egg + 1 egg yolk*; 2 teaspoons pure vanilla extract; 2 cups (250g) all-purpose flour (spoon & leveled); 2 teaspoons cornstarch (aka cornflour); 1 teaspoon baking soda; 1/2 teaspoon salt; 1 and 1/2 cup (225g) semi-sweet chocolate chips; optional: chocolate buttercream for topping