Add all the dry ingredients to a bowl and mix them together. Then add the vanilla extract and butter and with a spatula, fork or with clean hands mix everything together until all of the dry ingredients have been coated with butter and it becomes a crumble structure. Set it aside until it’s ready to be used.

Melt the butter in the microwave or in a small saucepan over low-medium heat. You don’t want it to bubble, as to not lose any of the liquid in the butter. Pour it into a big mixing bowl and let it cool down to room temperature in the fridge. Takes about 20 minutes.

Once the butter has reached room temperature add the granulated sugar and brown sugar and with spatula whisk it together for 1 minute. Alternatively, mix it together in a stand mixer using the paddle attachment.

Add the egg, vanilla extract and mix it in until combined.

In a separate bowl, stir together flour, baking powder, baking soda, cinnamon and salt. Add the dry ingredients and with spatula mix it together until just combined.

Once the hour has passed, place 6 cookies per baking tray and bake one tray at a time for 10-11 minutes.

Once baked, let them cool down on the baking tray for 3 minutes as they still will be soft when they are done. After they have cooled down a bit, use a spatula to lift them onto a cooling rack.

When the cookies have cooled down, mix all the ingredients together. If it's too thin add more powdered sugar, if it's too thick add a bit more milk. Drizzle it over the cookies.