Preheat the oven to 350°F (175°C)
Line an 8×8-inch baking pan with parchment paper
Mix rolled oats, chopped nuts, seeds, and a pinch of salt in a bowl
Warm honey or maple syrup with peanut butter and a little oil or butter in a saucepan
Stir in vanilla extract
Pour the wet mixture over the dry ingredients
Mix until everything is evenly coated
Fold in dried fruit or chocolate chips if desired
Press the mixture firmly into the prepared pan
Bake for 18 to 25 minutes until lightly golden
Cool completely in the pan
Lift out and cut into bars
Store in an airtight container