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1
Preheat oven to 350 degrees F. Line a 9x9 inch square baking pan with parchment paper so that there is some overhang on each side. Spray with nonstick spray.
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2
Add flour, sugar, butter, salt, and black gel food coloring to a food processor. Pulse until combined.
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3
Press the mixture into the prepared pan. Bake for 15 minutes, then let cool in pan for 15 minutes.
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4
Add cream cheese to the bowl of a standing mixer fitted with a paddle attachment. Beat until fluffy. Add sweetened condensed milk and beat. Add lime juice, extract, and green gel food coloring. Beat until combined. Pour mixture over cooled crust.
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5
Bake 30-35 minutes until set. Cool 30 minutes then cover with plastic wrap and refrigerate until chilled, 4 hours to overnight.
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6
Add candy melts to a microwave-safe bowl and microwave in 30 second intervals, whisking in between, until melted. Transfer to a piping bag. Pipe out 9 snakes, about 2 inches tall, onto a parchment-lined baking sheet, using a toothpick to move chocolate around. Use a printed template if needed. Refrigerate until set, about 10 minutes.
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7
Once snakes are dry, spray with metallic spray and let set.
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8
Lift chilled bars from pan and cut into even squares, 3 across and 3 vertical, so you have 9 squares total.
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9
Push mini M&M's into the bars in offset rows to create a snake-like pattern.
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10
Pipe some melted chocolate onto the back of the snakes and place in the center of the bars. Let dry before serving.