To make the batter, place eggs, flour, milk, salt, butter, cinnamon, and vanilla in a blender and mix for 30 seconds until smooth; set aside. For the filling, slice the strawberries and combine the blueberries in a bowl and set aside. Heat a 9" non-stick pan on medium heat and coat lightly with cooking spray. Ladle a small amount (¼ cup or 2 oz.) of the batter into the pan and then immediately tilt and swirl so the bottom is coated evenly with a thin layer of batter. Cook the crepe for about one minute, until the bottom is light brown. Loosen with a spatula, turn over and cook the other side for another minute. Stack finished crepes on a plate and continue until all batter is gone. To assemble the crepes, spread about 1 tablespoon of Nutella on the crepe, add approximately 1/3 cup of fruit mixture, then roll up like a burrito and serve.