In a large bowl, toss together the oats, flour, baking powder, cinnamon, salt, and dried blueberries. Set aside.
In a small bowl, whisk together the melted coconut oil, honey, and vanilla extract. Whisk in the collagen peptides until incorporated. Finally, whisk in the egg until completely combined.
Pour the liquid ingredients into the dry ingredients and stir until no pockets of dry ingredients remain. Cover and chill in the refrigerator at least 1 hour and up to 2 days. If chilling longer than 1 hour, allow to sit at room temperature for about 10 minutes before baking.
When you are ready to bake the cookies, preheat the oven to 325ºF. Line 2 large baking sheets with parchment paper or a silicone baking mat. Set aside.
Using a kitchen scale (this is the one we have and love), divide the dough evenly into 12 balls of dough (approximately 1.3 to 1.4 ounces each). If you aren't too concerned about the macronutrients and having exactly equal cookies, use a large cookie scoop and roll dough into balls. Place no more than 6 balls of dough on a cookie sheet at a time as cookies will spread significantly. Bake for 14 minutes or until golden brown. The centers will look underdone. Allow to cool at least 6 minutes on the baking sheet before transferring to a wire cooling rack to cool completely. Store cookies in an airtight container at room temperature up to 5 days. Baked cookies freeze well, as does unbaked rolled dough (up to 2 months). Do not thaw and add an extra minute to baking time.
Notes
*If you don't have instant oats, pulse 1 cup of old fashioned oats in a food processor or blender for about 8 medium length pulses. **You may certainly use sweetened dried blueberries, but your cookies will have a bit higher carb/sugar content and also won't be free of refined sugar.***A room temperature egg will incorporate into the warm fats much more easily than a cold egg. Allow egg to sit at room temperature for about 45 minutes. Don't have the time? Place cold egg in a glass or bowl of warm water for about 10 minutes.
All nutritional values are approximate and provided to the reader as a courtesy. Changing ingredients and/or quantities will alter the estimated nutritional calculations.