01 -
Turn your oven to 350°F and coat a 9x13 dish with some nonstick spray. Leave it to the side for now.
02 -
Put your cake mix, eggs, oil, and vanilla into a bowl and mix well. Carefully stir in the chocolate chips and M&Ms next.
03 -
Scoop the dough into the prepared dish and smooth it out evenly.
04 -
Pop the dish into the oven for about 20 to 25 minutes. Let it cool fully before cutting it into squares to serve.