COOK IT.
Preheat grill to 325°F. Close the flame broiler.
Line two large baking sheets with parchment paper. In a large bowl, combine cake mix, melted butter, eggs (or egg substitute), powdered sugar, sugar (optional), and vanilla and stir until combined.
Divide dough between 3 bowls and dye each bowl a different color. (We used green, blue and purple).
Roll dough into tablespoon-sized balls.
Place about 2” apart on the baking sheet and grill until tops have cracked and the tops look set, 8 to 10 minutes. – Turn halfway through baking, after 4-5 minutes.
Immediately, while the cookies are still warm, stick candy eyeballs all over the cookies.
Let cool completely before serving.
