Preheat oven to 250 degrees.
Place 24 pretzel snaps on cookie sheet lined with parchment paper.
Place a rolo in the middle of each pretzel.
Carefully place the cookie sheet in oven for 2 to 2 1/2 minutes.
*Note: You want the candy to be melted enough to press the m&m into, but not so melted that the rolo loses its' shape and the chocolate starts dripping off the pretzel. The exact amount of time in the oven will depend on your oven, so check after 2 minutes.*
Gently place green, yellow and brown m&m's on the top of the rolo. You don't need to press down on the m&m because the melted rolo will settle on its own. The cookie sheet will be hot from the oven so if the rolo's keep melting, stick the cookie sheet in the freezer for 3 to 5 minutes after you have place the m&m's to stop the melting process.