In a mixing bowl, add the creamy peanut butter, powdered sugar, vanilla extract, and salt. Use a spatula or electric mixer to blend these ingredients together until smooth and thoroughly combined.
Portion the peanut butter mixture into four equal parts. With clean hands, mold each portion into a tree shape.
Place the shaped peanut butter trees on a baking sheet lined with parchment paper. Refrigerate them for about 30 minutes.
Place the semi-sweet chocolate chips in a microwave-safe bowl. Heat them in the microwave in 20-second intervals, stirring between each heating, until the chocolate is completely melted and smooth.
If you wish to make your trees a festive green, add a few drops of green food coloring to the melted chocolate and stir well.
Take the chilled peanut butter trees out of the refrigerator. Dip each one entirely into the melted chocolate, ensuring every surface is coated.
Before the chocolate sets, sprinkle each tree with mini chocolate chips and colorful sprinkles.
After all the trees are dipped and adorned, return them to the refrigerator for an additional 15-20 minutes.
Notes
Arrange the finished Christmas trees on a decorative platter for a cheerful display.