In a large mixing bowl, combine the finely crushed chocolate sandwich cookies, creamy peanut butter, and powdered sugar. Use a spatula or your hands to mix well until the ingredients come together and form a dough-like consistency.
Scoop a tablespoon of the mixture and roll it into a ball, approximately 1-inch in diameter. Continue this process until all the mixture is shaped into about 16 balls.
Arrange the cookie balls on a baking sheet lined with parchment paper. Place them in the refrigerator for about 30 minutes to firm up nicely.
While the cookie balls are chilling, prepare to melt the chocolate. In a microwave-safe bowl, combine the chocolate chips and vegetable oil. Microwave in 30-second intervals, stirring in between, until the mixture is completely smooth and glossy.
Once the cookie balls are firm, remove them from the refrigerator. Dip each ball into the melted chocolate, ensuring that they are thoroughly coated. Place the chocolate-covered balls back onto the parchment paper.
While the chocolate coating is still wet, gently press two pretzel twists into the top of each chocolate-coated ball to resemble antlers.
Carefully place two candy eyes on each reindeer treat and top with a red M&M as the nose, slightly pressing them into the chocolate.
Allow the chocolate to set completely at room temperature or refrigerate briefly for a quicker firming process.
Notes
Arrange your delightful reindeer treats on a festive platter. For an extra holiday flair, sprinkle some green and red sprinkles around them.