Line an 8×8 inch pan with parchment paper.
Add the peanut butter and honey to a small pot or microwave-safe bowl. Warm them gently — either on the stove over low heat for 1–2 minutes or in the microwave for 20–25 seconds.
Add the vanilla extract and a small pinch of salt. Mix until the texture looks glossy and blended.
In a large mixing bowl, add: Rolled oats, nuts (if using), any extra add-ins you like. Give everything a good stir.
Pour the warm peanut butter mixture into the bowl of oats. Use a spatula to fold and mix until everything is coated. If the mixture feels too dry, add 1–2 teaspoons of warm honey. If it feels too wet, sprinkle in a handful of oats.
Wait 2–3 minutes before adding the chocolate chips. Transfer the mixture to the prepared pan.
Use a spatula — or the back of a spoon — to press it down as firmly as you can. The tighter you pack the mixture, the better the bars hold together. You can also lay a piece of parchment on top and press with your hands.
Place the pan in the refrigerator for 1–2 hours or in the freezer for 20–30 minutes.
