Buckwheat Crepes

Name: Buckwheat Crepes
Ingredients: 5 tablespoons unsalted butter, plus more for the skillet; 2/3 cup buckwheat flour; 1/3 cup all-purpose flour; 1 3/4 cups whole milk; 3 large eggs; 1/2 teaspoon salt; 1/4 cup chopped fresh parsley (optional); Sweet Onion Crepe Filling, recipe follows; Sauteed Spinach Crepe Filling, recipe follows; Creamy Mushroom Crepe Filling, recipe follows; Citrus Shrimp Crepe Filling, recipe follows