In a mixing bowl, whisk together the all-purpose flour, baking powder, and cinnamon. Set aside.

Place the softened butter, sugar, and brown sugar to the bowl of a stand mixer and beat until light and fluffy.

Add the eggs and vanilla and mix until combined.

Pour the dry ingredients into the bowl of the stand mixer with the butter and sugar mixture. Beat until combined and cookie dough forms. Refrigerate the dough for at least 1 hour.

Use a rolling pin to roll out the dough on a floured surface until it is about ¼-1/8 inch thick and use a Mickey Mouse cookie cutter to cut shapes out of the dough.

Place the cookies on a parchment paper-lined baking sheet and bake at 400 degrees for 6-8 minutes. Remove from the oven and transfer to a cooling rack.

Place the butter and brown sugar to a stand mixer or food processor. Blend together. Add the powdered sugar and vanilla extract and mix together.

If necessary, add 1 tablespoon of milk or heavy cream until the desired consistency is reached.

Add the frosting to a disposable piping bag or ziplock bag, then add a swirl to both Mickey ears and the head. Sprinkle with sparkling sugar sprinkles, if desired.