If refrigerating the dough overnight: The next day, remove the dough from the fridge and let it sit at room temperature for 30 to 45 minutes. Then continue with the following steps.
Line 2 baking sheets with parchment paper.
Gently punch down the dough and then divide dough into 16 equal size portions and form balls.
Arrange on prepared pans, cover with plastic, and allow to rest in a warm place for 1.5 hours. Please note that cold dough (if you refrigerated it) may need a longer second rise - up to 2 hours - until visibly puffy and soft.
Preheat oven to 350 degrees
Grease and flour the bottom of a 1/3 cup dry measure or a glass with a 2 1/4 inch diameter and use to make deep indents on top of each ball until bottom of measure touches baking sheet (see photo)
Fill each indentation with about 1.5 tablespoons of filling (if you are making both cheese and fruit filling, you will need only half of each filling recipe)
Brush tops of each pastry with egg wash, and then sprinkle sides with streusel
Bake for 20 to 25 minutes (do not over bake - you want them very pale in color) and let cool for about 20 minutes.
Serve warm