**Prepare the pan**
Line an 8x8-inch baking pan with parchment paper, leaving a bit of overhang on the sides for easy removal.
**Mix the dry ingredients**
In a large mixing bowl, combine the oats, chopped nuts, dried fruit, and a pinch of salt. If using chocolate chips, set them aside for later to prevent melting.
**Make the binding mixture**
In a small saucepan, heat the nut butter, honey (or maple syrup), and vanilla extract over low heat, stirring constantly until smooth and fully combined.
**Combine and mix**
Pour the warm nut butter mixture over the dry ingredients and mix thoroughly until everything is evenly coated. If using chocolate chips, fold them in once the mixture has cooled slightly.
**Press into the pan**
Transfer the mixture to the prepared baking pan and press it firmly into an even layer using a spatula or the back of a spoon.
**Chill**
Refrigerate for at least 1 hour, or until the bars are firm and set.
**Cut and serve**
Remove the bars from the pan using the parchment paper overhang. Slice into bars or squares and enjoy!