6teaspoonsdrops of green gel food coloringor 1 and 1/4 liquid green food coloring
1bottle of red hot candies or 1/2 cup red candy coated chocolatessuch as mini M&M's
Line a sheet pan with parchment paper or a silicone baking mat.
Place the marshmallows and butter in a large bowl. Microwave in 30 second increments until melted.
Add the green food coloring and vanilla; stir until the marshmallow mixture is smooth.
Add the cornflakes to the bowl and gently stir to coat the cereal evenly with the marshmallow mixture.
Pack the mixture into a greased 1/4 cup measuring cup and turn out onto the sheet pan. Use your fingers to make a hole in the middle to form a wreath shape and decorate with red candies. It's easiest to form the wreath holes if your fingers are damp or coated in cooking spray.