The packets that come with the mix are really small! I've added 3T and been happy with the results (the kids are happy I mean). I use what I call "jimmies"- kinda long and solid looking. Work great for me.
I make my own confetti cakes all the time (brides like to have their wedding colors).........anyhow I add about 1 Tblsp. per 3 c. of cake batter (a standard cake mix is like 5 or 6 cups I think)....so you would add 2 Tbsp.
