In a large bowl, whisk together the flour, cake mix, salt, and baking soda. Set aside.
In another bowl, beat the butter, brown sugar, and white sugar with an electric mixer until light and fluffy.
Add the egg, vanilla and cake batter extract then mix until combined.
Slowly add the dry ingredients to the wet ingredients and mix until just combined.
Stir in the chocolate chips and sprinkles.
Cover the dough with plastic wrap and refrigerate for at least 2 hours.
Preheat oven to 350 degrees.
Line your cookie sheets with parchment paper.
Scoop about 2.5 tablespoons of dough per cookie and shape into balls that are slightly taller than wide.
Bake for 13–15 minutes, until edges are just lightly browned.
You want them to still be soft in the center for a nice chewy cookies.
Cool cookies on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
While they are cooling make the frosting.
Using an electric mixer whip the butter until fluffy.
Add in the extract.
Slowly add in the powdered sugar.
Beat until a nice fluffy consistency.
Pipe onto your completely cooled cookies.
Sprinkle with Christmas sprinkles.
Serve!