Preheat the oven to 180°.
Line a cookie sheet with parchment paper or a silicone baking mat.
Arrange the pretzels in a single layer on the cookie sheet.
Top each pretzel with an unwrapped rolo.
Place in the preheated oven for 5 minutes.
Immediately after taking them out of the oven, press an M&M onto the top of the rolo, pressing down gently.
Allow the treats to cool completely (can toss in the fridge to speed up this process) before serving.
Store in and air tight container for up to 3 days.