In a lightly buttered 9-inch (23 cm) non-stick skillet over medium-high heat, cook 1 crepe using ½ cup (125 ml) of the batter. When the edges begin to brown and lift off the pan easily, flip the crepe over. Layer 1 slice of ham and ¼ cup (25 g) of the cheese on one half of the crepe. Fold the crepe over the filling. Set aside on a plate and keep warm. Repeat with the remaining ingredients.