Preheat oven to 350 degrees.
Add oats, flour, and baking powder into a blender and blend on high pulse until oats are smooth and grain-like, about one minute. Set aside in a large mixing bowl.
Add the rest of the ingredients in the blender and blend from low to high for about 1 minute until well combined.
Pour mixture in blender into the bowl with the dry ingredients and stir well to combine.
Pour the pancake mixture on a baking sheet laid with parchment paper and use a spoon to gently spread across the entire baking sheet.
Set baking sheet in oven and bake for 10 minutes.
Remove from oven and let cool for 5 minutes.
Once cool, use a tree shape cutter to make trees throughout the entire baking sheet (should make about 12).