Line a small baking dish or loaf pan with parchment paper.
In a large bowl, combine the oats, coconut, pistachios, chia seeds, and any additional dry mix-ins.
In a saucepan over low heat, warm the peanut butter until smooth and easy to stir.
Remove from heat and stir in the honey, vanilla extract, and salt.
Pour the wet mixture over the dry ingredients and mix until everything is well coated.
Transfer the mixture to the prepared pan.
Press firmly into an even layer. The more firmly you press, the better the bars will hold together.
If desired, sprinkle additional coconut or chocolate chips on top and press them into the bars
Refrigerate for at least one hour or overnight.
Slice into bars and enjoy.