• Preheat your oven to 350°F.

Prepare the Cookie Dough

• Combine the softened butter, granulated sugar and light brown sugar in a large mixing bowl.
• Use an electric hand mixer to whisk the ingredients together until smooth and creamy.
• Add the egg and vanilla. Whisk for one minute.
• Reduce the speed of your hand mixer and gently whisk in the flour, baking powder and baking soda. Make sure no dry or wet pockets remain in your cookie dough.
• Set the cookie dough aside.

Make the Cinnamon Sugar

• Add the softened butter, brown sugar, flour and cinnamon to a bowl.
• Stir the mixture to combine.

Make Cookie Dough Balls

• Break the cinnamon sugar mixture into large pieces and gently fold it into the cookie dough to create a marbling effect in the cookie dough.
• Use a standard-size cookie scoop to drop balls of cookie dough onto a baking sheet.

Bake the Cookies

• Bake your cookies for 12 minutes.
• Let them cool for a few minutes and then move them to a wire cooling rack to cool completely before serving.