Preheat oven to 325 degrees and line two cookie sheets with parchment paper.
Using a large bowl, beat together the butter, sugar, brown sugar, eggs, and vanilla until combined and fluffy.
In a medium bowl, whisk the flour, oats, baking soda, baking powder, kosher salt, and cinnamon.
Gradually beat in the dry ingredients until combined.
Fold in the chocolate chips and chopped walnuts.
Touch the dough with your hands to see if it is still sticky, if so, mix in about ½ - ¾ C flour.
Sprinkle flour onto a cutting board and roll the cookie dough into ½ in thick.
Use the cookie cutter and cut out mickey mouse shapes.
Bake in the oven for 10-12 minutes or until the cookies are a light golden brown.
Remove from oven and allow to cool before eating.
Enjoy!