Preheat the oven to 350 degrees.
Line a 9x13 baking dish with foil and spray with non-stick cooking spray.
Combine the brownie mix and ingredients, mixing well.
Pour the brownie batter into the prepared baking dish.
Bake for 18-22 minutes.
Remove from oven and let cool completely.
Use the heart cookie cutters to cut the brownies. The heart cookie cutters I used are linked below.
Attach the frosting tip and fill the piping bag with frosting. Gently squeeze the frosting out and onto the brownie.
Give each frosted brownie a few candy eyes. Repeat with all the brownies!