We use Swerve's Confectioners Sugar because it's sugar-free, low carb, and keto-friendly. You could also use Truvia or monk fruit sweeteners as well. We prefer a powdered sugar for this recipe though.
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper. In a medium bowl, combine PB2 powder, oat flour, almond flour, coconut sugar, ground flaxseed, baking powder and salt.