How to Make It
Preheat oven to 350°F. Beat cream cheese, lemon curd, and 1/8 teaspoon salt with an electric mixer on medium speed until smooth, about 3 minutes.
Grease a 13- x 9-inch baking dish with butter. Arrange 1 crêpe on a work surface. Using a small offset spatula, spread 1 1/2 tablespoons cream cheese mixture evenly over crêpe, leaving a 1-inch border. Fold crêpe in half, and then fold in half again. Place folded crêpe in prepared baking dish. Repeat with remaining crêpes and remaining cream cheese mixture, overlapping folded crêpes in baking dish. Bake in preheated oven until crêpes are heated through and edges are golden brown, 15 to 20 minutes.
Meanwhile, melt butter in a large nonstick skillet over medium-low. Add lemon slices, sprinkle with remaining 1/8 teaspoon salt, and cook, stirring occasionally, until lemon peel is softened, about 7 minutes. Stir in maple syrup, and remove from heat. Spoon lemon sauce over casserole. Dust with powdered sugar, and serve.