In a bowl, combine the pretzels, oats, and cereal.

In a pan over low heat, combine the corn syrup and brown sugar. Wait for the mixture to bubble for about a minute then remove from heat. Add the peanut butter.

Pour the pan mixture into the cereal mixture and stir.

Firmly press the mixture into an 8x8 baking dish lined with parchment paper. Set aside.

In a bowl, add the chocolate chips and peanut butter. Microwave for 30 second intervals until smooth then pour over the mixture evenly.

Place in the refrigerator for 30 minutes to 1 hour or the freezer for 20-30 minutes.

When the bars are set, remove them from the pan. Cut down the middle then cut each half into 5 triangles.

Mix together the powdered sugar and milk then add the green food coloring. Add to a piping bag and pipe zig zag lines onto the trees with the sprinkles you chose.