In a bowl of a stand mixer add the butter and sugar. Mix on medium until light and fluffy, about 4 minutes. Add eggs to the sugar mixture, with the mixer speed on low until combined. In a large bowl add cake flour, all-purpose flour, oats, cornstarch, baking soda, salt, and cinnamon and whisk until combined.

Slowly add the dry mix to the sugar mixture, and mix on low speed. Add in the white chocolate chips, holiday sprinkles, and M&M’s, and mix on low until combined. Cover the dough with plastic wrap and chill dough for 15-20 minutes.

Preheat the oven to 410 degrees. Place the dough on a well-floured surface. Using a rolling pin, roll out the dough to ½ inch of thickness. With a medium-sized circle cookie cutter, cut out 24 circles and place them on a baking parchment-covered baking pan.

Bake for 10 minutes or until golden brown on the top. Remove the cookies from the oven and let them cool for 5 minutes. Then transfer the cookies to wire racks to cool completely