Place the flour in a batter bowl or mixing bowl. In another bowl, whisk the milk, egg, sugar, salt and vanilla until blended. Whisk the egg mixture into the flour mixture until mixture is smooth. Let this mixture rest while oven heats up; this allows the gluten to relax. Place two 4-inch skillets in the oven. Heat the oven to 425F. When the oven comes to temperature, remove skillets from oven and divide butter among them. Place back in the oven for a minute to let bubbling of butter subside. Pour rested batter evenly into hot skillets. Bake for 15 minutes or until puffed and golden brown. Dust with powdered sugar and fill with strawberries.

For the strawberries: Toss it all together just prior to starting the kropsua