Line an 8-inch loaf pan with parchment paper or wax paper. Set aside. Clear some space in the freezer for this pan—you will need it later.
Use the double boiler method or the following: Add chocolate chips and peanut butter to a medium, microwave-safe bowl. Heat in 20-second increments until chocolate is softened and melty. Stir in between heating increments, until smooth.
Pour this mixture into the prepared loaf pan. Tap the pan to create an even layer.
Transfer pan to freezer. Freeze for 40-60 minutes or until completely firm. Remove from freezer and slice into 18 squares. Enjoy! Storing instructions below.
Storing Instructions: Store in an airtight container in a cool, dark environment at room temperature, or in the refrigerator, for up 2-3 weeks.Freezing Instructions: Store in an airtight, freezer-friendly container in the freezer for 1-2 months. Very firm, but enjoyable straight out of the freezer. If preferred, thaw for 10 minutes.