Preheat your oven to 425°F (220°C).

Whisk together the eggs in a large mixing bowl until frothy. Gradually add milk, flour, vanilla extract, and salt, mixing until smooth.

In a heavy skillet, melt butter over medium heat, then sauté sliced apples with brown sugar and cinnamon for 5-7 minutes until tender.

Pour the batter over the sautéed apples in the skillet, ensuring even coverage.

Bake in the oven for about 20 minutes until puffed and golden brown.

After baking, remove from the oven, let cool slightly, then cut and serve warm, optionally dusted with powdered sugar or topped with fresh fruit.