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Bake the cake following the box directions. Let it cool completely, then crumble it into a large bowl.
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Add the vanilla frosting a little at a time, starting with about ½ cup, and mix until the crumbs hold together like dough.
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Mix in a few drops of green gel food coloring until you get the green you want.
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Roll into balls about 1 to 1 ½ inches wide. Place them on a parchment-lined tray and chill for 20 to 30 minutes.
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Melt the white chocolate in the microwave in short bursts, stirring often. Stir in a few drops of green gel food coloring. If it gets too thick, warm it again briefly.
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Dip the end of each lollipop stick in the green chocolate and press it into a cake ball.
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Dip each cake pop completely in the green chocolate. Gently tap off the extra and add sprinkles right away, if using.
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Stand the cake pops in a foam block or stand. Let them set at room temperature, or chill for 15 to 20 minutes until firm.