Preheat oven to 350 degrees. Spray a 9 x 13 baking pan with non-stick cooking spray.
In a large bowl, add cake mix, evaporated milk, and butter. Blend with a mixer until it becomes a thick and sticky dough.
Press half of the dough into the bottom of the prepared 9 x13 pan.
Bake for 8-9 minutes until appears set.
Top base with Rolos placing them cut side down.
Drop small spoonfuls of the remaining dough over the Rolo candies.
Place back in the oven and bake for 20-25 minutes until top of the bars begin to get golden brown.
Allow to cool and cut into squares.