Preheat oven to 350 degrees.
In a stand mixer combine cake mix, oil, eggs and flour. Mix on medium speed for 1 minute or until well combined.
Using a 2 tablespoon cookie scoop, scoop out cookie dough and form each one into a ball.
Press one peppermint patty into each ball and form cookie dough around the candy.
Place cookie dough balls onto a cookie sheet evenly spaced. 24 dough balls divided onto two cookie sheets.
Bake for 7-8 minutes.
Remove cookies to a wire rack to cool completely.
In a medium heat proof bowl, melt mint baking chips in the microwave for 20-30 seconds until melted.
Pour chocolate into a pastry bag or gallon baggie. With scissors snip off a tiny opening.
Drizzle melted mint chips over the cookies.
Allow for chocolate to set for 20 minutes before serving or storing.