Preheat your oven to 350°F (175°C) and line a muffin tin with silicone or parchment liners.
Place the rolled oats in a blender or food processor and pulse until they reach a fine flour consistency.
In a medium mixing bowl, whisk together the Greek yogurt, egg, vanilla extract, and maple syrup until smooth.
Add the ground oat flour, vanilla protein powder, baking powder, and sea salt to the wet ingredients, stirring until just combined.
Gently fold the fresh blueberries into the batter using a spatula to avoid crushing them.
In a small separate bowl, combine the almond flour, coconut oil, and cinnamon, mixing with a fork until a crumbly texture forms.
Divide the muffin batter evenly among three muffin cups, then sprinkle the almond crumble over the top of each.
Bake for 20-22 minutes, or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack.