Preheat oven to 350 degrees

Line 9" square pan with parchment & set aside

Combine cake mix, oil & eggs in mixer bowl & stir at a low speed until fully combined & smooth

Transfer batter into prepared pan & press into an even flat layer

Top with peppermint patties & press in slightly

Bake 25-30 minutes or until toothpick test comes out clean

Cool completely on wire rack before cutting & serving