Preheat the oven to 165°C/330°F degrees and line the baking sheet with parchment.
In a large mixing bowl, mix peanut butter, honey, ghee, and an egg white until combined.
Add oats and whey protein powder. Mix well, until all of the oats get coated and form small chunks. You can use a spatula or mix with your hand to massage the mixture evenly.
Add roughly chopped nuts into the mixture. Mix until the nuts are evenly incorporated, they don't need to be coated in the mixture.
Pour the granola onto the prepared baking sheet. Use a spatula to distribute it evenly on the sheet.
Bake for 15-18 minutes or until light golden brown. To ensure even bake through, stir the granola 2 times during the baking – after 10 minutes and after 15 minutes of baking.
Let the granola cool completely on the baking sheet (1-2 hours). Add optional mix-ins of your liking – dried fruit and/or chocolate.
Store completely cooled granola in the air-tight container at room temperature out of the sunlight for 1-2 weeks.