Position the oven rack in the center. Place a cast iron skillet or oven-safe pan inside and preheat to 450°F (230°C).
In a blender or mixing bowl, whisk together the eggs, milk, flour, and salt until smooth. Avoid overmixing. Let the batter rest while the oven finishes heating.
3 large eggs, ½ cup all-purpose flour, ¾ cup milk, ¼ teaspoon salt
Carefully remove the hot pan from the oven (use oven mitts). Place it on the stovetop over medium-high heat. Lightly spray with olive oil to prevent sticking, especially in any hot spots. Add the butter and swirl until fully melted and the pan is well-coated.
1 tablespoon olive oil, 2 tablespoons butter
Immediately pour the batter into the hot pan. Return the pan to the oven right away. Bake for about 18 minutes, rotating the pan halfway through for even puffing and browning. The pancake should rise dramatically and turn golden.
Remove from the oven and transfer to a serving plate. Dust with powdered sugar and top with fresh fruit or drizzle with maple syrup.
Powdered sugar, Fresh mixed fruit, Maple syrup