Put oatmeal and nuts in a large bowl.
Gently heat and mix peanut butter, honey, and salt until combined.
Pour the melted peanut butter mixture over the oatmeal and nuts, and mix evenly.
Line a baking pan with parchment paper and spread the mixture evenly.
Bake at 170°C (338°F) for about 20–25 minutes.
Let cool, then break into bite-size pieces.