Preparation Preheat oven to 350°F. Place butter in a 2–3-qt. shallow baking dish or medium (10") ovenproof skillet. Transfer to preheating oven and heat until butter has melted, about 4–6 minutes. Meanwhile, blend eggs, milk, lemon zest, salt, vanilla, and 1/3 cup granulated sugar in a blender until frothy, about 2 minutes. Add flour and blend just until combined. Pour batter into hot baking dish. Arrange fruit evenly over. Sprinkle with remaining 2 Tbsp. granulated sugar. Bake clafoutis until top is puffed and lightly golden brown, 25–35 minutes. Let cool slightly, then sift powdered sugar over (if using). Serve warm.
Preparation Preheat oven to 350°F. Place butter in a 2–3-qt. shallow baking dish or medium (10") ovenproof skillet. Transfer to preheating oven and heat until butter has melted, about 4–6 minutes. Meanwhile, blend eggs, milk, lemon zest, salt, vanilla, and 1/3 cup granulated sugar in a blender until frothy, about 2 minutes. Add flour and blend just until combined. Pour batter into hot baking dish. Arrange fruit evenly over. Sprinkle with remaining 2 Tbsp. granulated sugar. Bake clafoutis until top is puffed and lightly golden brown, 25–35 minutes. Let cool slightly, then sift powdered sugar over (if using). Serve warm.