01 - Whisk flour and salt in a large bowl. Create a well in center, add eggs, and gradually whisk in milk and melted butter until smooth. Rest batter for 10 minutes.
02 - Heat nonstick crepe pan over medium heat, lightly brush with butter. Pour 1/4 cup batter, swirling to coat bottom thinly. Cook 1-2 minutes until edges lift and golden. Flip and cook 30 seconds. Repeat with remaining batter.
03 - Preheat oven to 350°F.
04 - Layer ham slices, spinach, cheese, and crème fraîche on each crepe. Season with black pepper.
05 - Fold crepes into quarters or rolls. Arrange in baking dish and sprinkle remaining cheese on top.
06 - Bake for 8-10 minutes until cheese melts and crepes are heated through.
07 - Serve immediately, garnished with fresh spinach or paired with side salad if desired.