Step 1: Preheat the Oven - Start by preheating your oven to 350°F (175°C). This is a crucial step to ensure your cookies bake evenly right from the start.
Step 2: Cream the Butter and Sugars - In your mixing bowl, combine the softened unsalted butter, light brown sugar, and white granulated sugar. Using a rubber spatula, mix until the mixture is light and fluffy, which should take about 2-3 minutes.
Step 3: Add the Egg and Nutella - Add the large egg and Nutella to the butter and sugar mixture. Mix until fully incorporated and the batter is smooth and glossy.
Step 4: Combine Dry Ingredients - In a separate bowl, whisk together the all-purpose flour, cornstarch, and salt. This step helps to evenly distribute the dry ingredients.
Step 5: Mix Dry Ingredients into Wet Ingredients - Gradually add the dry mixture into the wet ingredients, mixing just until combined. Be careful not to overmix, as this can lead to tougher cookies.
Step 6: Scoop the Dough - Using a cookie scoop or spoon, portion out the dough and place it onto a baking sheet lined with parchment paper. Make sure to leave some space between each cookie, as they will spread while baking.
Step 7: Bake the Cookies - Place the baking sheet in your preheated oven and bake for 10-12 minutes, or until the edges are lightly golden. The centers may look a bit underbaked, but they will continue to cook as they cool.
Step 8: Cool and Enjoy! - Once baked, remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely. Enjoy these cookies warm, or store them for later!
