01 - 
                Cut the butter into pats and arrange them in a 9x13 inch baking dish. Preheat the oven to 425 degrees Fahrenheit and place the dish in the oven until the butter melts.
              
              
              
                02 - 
                In a blender, combine eggs, milk, flour, salt, cinnamon, and vanilla extract. Pulse until the mixture is smooth and evenly combined.
              
              
              
                03 - 
                Pour the batter over the melted butter in the baking dish. Bake for 22 minutes or until the edges are puffed and lightly browned.
              
              
              
                04 - 
                Cut into slices and serve. Optionally, top with powdered sugar, syrup, whipped cream, or fresh fruits.