One Bowl Oatmeal Chocolate Chunk Cookies in Steps

• In your mixing bowl, combine the room temperature unsalted butter, packed light brown sugar, and granulated white sugar. Use a spatula or a mixer to blend them together until the mixture is smooth and creamy.
• Add the large egg and egg yolk to the butter-sugar mixture. Mix until well incorporated, ensuring a silky texture.
• Stir in the ground cinnamon and vanilla extract. The sweet and spicy aroma will begin to fill your kitchen—what a treat!
• Sprinkle the baking soda and salt over the mixture, then add the all-purpose flour and rolled oats. Mix until just combined, being careful not to overmix.
• Fold in the chopped dark chocolate. This is where the magic happens as you create pockets of melted chocolate in your cookies.
• Using a spoon or cookie scoop, drop rounded tablespoons of the dough onto a baking sheet lined with parchment paper. Leave some space between each cookie as they will spread while baking.
• Bake the cookies in your preheated oven at 350°F (175°C) for about 10-12 minutes, or until the edges are lightly golden. Allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.