Preheat oven to 450 degrees. Place the butter in a 10-12 inch oven proof skillet (I like cast iron) or a 7 x11 inch baking dish. Place pan in the oven to melt the butter while the oven preheats.

In a blender combine the eggs, milk, salt, and vanilla. Blend until well blended.

Add the flour to the blender and blend until smooth.

Remove the skillet or pan from the oven. Make sure the butter is completely melted and pour the batter from the blender into the pan.

Sprinkle with the frozen berries and bake until puffed and browned for about 12 to 15 minutes.

Cut into 4 pieces and serve with sprinkled powdered sugar or syrup.