Preheat the oven to 160C/325F. Line a large baking tray with parchment paper and set aside.
In a large mixing bowl, add the oats and protein powder and mix well. In a microwave safe bowl, add the peanut butter and maple syrup and microwave in 20-second spurts, until the peanut butter has melted.
Add the wet ingredients to the dry ingredients and mix well until fully incorporated.
Transfer the protein granola mixture onto the lined baking tray and spread out in an even layer. Place the baking tray in the oven and bake for 20 minutes, stirring the granola halfway through.
Remove the granola from the oven and mix once more. The granola should look lightly golden and brown around the edges and crisp to the touch. Let it cool completely. It may not look fully crisp once out of the oven, but it will continue to crisp as it cools. Once it reaches room temperature, transfer it to a large mixing bowl and add your mix-ins.
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Notes
Protein powder: Use vanilla or plain protein powder. Please do not use whey, as it will result in a dry, crumbly granola. It must be casein, pea, or brown rice protein. Nut/seed butter: Any nut or seed butter works. Mix-in ideas: Dried fruit, banana chips, and chocolate chips are great to fold through once the granola has cooled. Leftovers: Keep at room temperature, covered, for up to one month.Nutritional calculation: The nutritional content is calculated using Optimum Nutrition Vanilla Casein. Other brands of protein powder can vary in protein per serving. Serving size: Heaping 1/2 cup (70g).