Line an 8x8-inch pan with aluminum foil, extending it over the edges.
Lightly grease the foiled pan.
In a large bowl, combine the brownie mix, water, oil, and egg, and stir until combined.
Pour half of the brownie batter into the prepared pan.
Scatter the brownie batter with 2/3 of the assorted candy.
Carefully spoon and spread the remaining brownie batter over the candy layer.
Scatter the remaining candy over the top.
Bake at 350 degrees for 40 minutes, or until a toothpick inserted near the center comes out (mostly) clean - these will be pretty chocolatey with all the candy!
Transfer to a wire rack to cool completely.
Remove from pan by lifting edges of the foil. Remove the foil.
Cut into bars, and EAT!