Place the eggs, milk, vanilla extract, sugar, salt, and flour into a blender. Pulse until no dry lumps remain in the batter. Melt the butter in an 8-inch, cast-iron skillet over medium-high heat. Pour in the batter, and drop in the strawberries.
Place the skillet into the oven, and bake until puffed and golden, 20 to 25 minutes. Remove from the oven and serve immediately.