Mix the Crunchy Base: In a large bowl, combine the crushed pretzels, quick oats, and crispy rice cereal. This will be the crunchy, chewy foundation of your Christmas trees.

Heat the Sweet Mixture: In a small saucepan over low heat, stir together the corn syrup and light brown sugar. Let the mixture bubble gently for about a minute, then remove from the heat and stir in the creamy peanut butter until smooth.

Combine Everything: Pour the warm peanut butter mixture over the cereal mixture. Stir well to coat everything evenly and create a sticky, delicious base.

Press into the Pan: Line an 8x8-inch baking dish with parchment paper. Firmly press the mixture into the pan, smoothing it into an even layer. Set it aside while you prepare the topping.

Make the Chocolate Topping: In a microwave-safe bowl, combine the semisweet chocolate chips and creamy peanut butter. Microwave in 30-second intervals, stirring in between, until the mixture is completely melted and smooth. Pour it over the peanut butter base and spread evenly.

Chill Until Set: Place the pan in the refrigerator for 30 minutes to 1 hour, or in the freezer for 20–30 minutes, until the bars are firm and easy to cut.

Cut into Trees: Once the bars are set, lift them out of the pan. Cut down the center, then slice each half into five triangles to create tree shapes.

Add the Festive Icing: In a small bowl, whisk together powdered sugar and milk to make the icing. Stir in a few drops of green gel food coloring for that classic Christmas tree look. Add the icing to a piping bag and pipe zigzag lines across each tree, then decorate with your favorite sprinkles.

Enjoy Your Holiday Treats: Serve and enjoy these no-bake Peanut Butter Christmas Trees with family and friends!