Prepare a 9x9 inch baking dish by lining it with parchment then spraying sides with baking spray.
Press cookie dough into bottom of pan.
Place one layer of Oreo's on top of cookie dough. You will most likely only have room for 9 cookies, but can cut cookies in half and squeeze into edges if you want full coverage.
Prepare brownies according to directions on package and pour over Oreo's and cookie dough.
Bake at 350 degrees F for 35-45 minutes, or until an inserted toothpick is removed mostly clean. (A couple crumbs are ok)
Allow brownies to cool to room temperature, then using a 2-inch round cookie cutter, punch out nine sections.
Place those section in the fridge for at least 30 minutes.
Prepare chocolate coating by melted the chocolate and oil in the microwave for 1 minute. Remove and stir well, then place back in microwave in 30 second increments until chocolate is completely melted.
Grab the stick and dip it into the chocolate (just an inch or so) then gently insert stick into cut edge of the brownie. Do this to all brownies then place back in the fridge for at least 15 minutes.
Chop all snickers into very small pieces. This works best when snickers are chilled. Place in a flat layer (pieces not touching if possible) until ready to assemble.
Prepare a baking sheet with a piece of parchment paper. Set aside.
When ready to coat the brownies, pick one up by the stick and hold over the chocolate. Drizzle the chocolate over the brownie and coat completely. Shake off excess.
Take about a tablespoon of snickers pieces and gently press into the top of the brownie. Place the brownie bite SNICKERS SIDE DOWN onto the baking sheet covered with parchment. Coat all 9 brownies, then place in refrigerator to allow chocolate to set. Can be served at room temperature.