Preheat the oven to 350 and line a baking sheet with parchment paper or silicone mats.
In a large bowl add softened unsalted butter, dark brown sugar, and granulated sugar. With an electric mixer, cream butter and sugars on high speed until well combined, light, and fluffy.
In a small bowl combine the egg, vanilla extract, salt, and baking powder. Add the egg mixture to the butter mixture and beat on medium speed until the mixture is combined.
Slowly add the flower about ½ cup at a time and beat on low speed between each addition. The flour should be almost fully mixed in before adding the next addition.
Once the flour is almost completely combined, add the mini chocolate chips and beat on low until they are evenly dispersed. If the mixture looks a bit crumbly, breifly knead it with your hands and it should come together very easily.
Roll dough to ¼" thickness. I prefer to do this between two sheets of wax pape
Cut your shapes with your cookie cutter and line the cookie sheet leaving at least 1" between cookies.
Bake cookies in the preheated oven for 10-12 minutes or until the edges are slightly golden brown.
Allow the cookies to cool on the baking sheet for at least 5 minutes before using a spatula to transfer to a wire rack to cool.
Serve plain or decorate with royal icing and enjoy!