Preheat oven to 350° F. In large mixing bowl, combine cooked sausage, shredded cheese, cream cheese, 1 cup sour cream, onions and chilies; mix well. Spread about 3 tablespoons of filling along the right side of each crepe shell; roll shell over filling to form a log. (To make triangle-shaped crepes, spread filling over one quadrant of each crepe; fold in half, then fold in half again). Place filled crepes on a lightly greased cookie sheet and bake 12 to 15 minutes, until heated through. Melt butter in a small saucepan over low heat; stir in 1 1/2 cups sour cream and heat until warm. Drizzle 1 tablespoon over each baked crepe and top with your favorite salsa or chopped tomatoes and cilantro, if desired. Note: Crepes may be filled and frozen for later use; bake frozen crepes for 25 to 30 minutes.