Preheat the oven to 300° Fahrenheit. Prepare a baking sheet by lining it with a silicone mat or parchment paper.

In a medium sized bowl, whisk the egg whites until frothy.

Add the oats, sweetener, nuts, and add-ins. Stir with a rubber spatula until evenly coated in the egg whites.

Spread in an even layer over the baking sheet.

Bake for 40 to 50 minutes, stirring about halfway (be careful to retain clusters), or until the desired golden brown crunchiness is achieved.

Store in an airtight container.