Dutch Baby Apple Pancake

Preheat the oven to 375°F. Whisk the eggs, vanilla and 2 tablespoons of butter in a blender until smooth. Combine flour, salt, and 1/4 teaspoon cinnamon.In a 10-inch nonstick skillet, combine the remaining butter and cinnamon with the brown sugar and lemon juice. Bring to a boil over medium-high heat, stirring occasionally. Add the apples, reduce the heat to low, and simmer, stirring frequently, until the apples are soft and the liquid thickens, about 7 minutes.Pour the batter from the blender over the apple mixture; sprinkle with nuts if desired. Bake until the dough is lightly browned, 25 to 30 minutes. If desired, sprinkle with powdered sugar.