Preheat the oven to 375°F (190°C) and coat a 12-cup mini muffin tin with non-stick cooking spray.
In a large mixing bowl, combine the Greek yogurt and self-rising flour. Stir until a shaggy dough forms.
Transfer the dough to a lightly floured surface and knead for 2 to 3 minutes until smooth and no longer sticky.
Divide the dough into 12 equal-sized balls, approximately 30 grams each.
Press each dough ball into the bottom and up the sides of the prepared muffin tin cups to create a well.
Place one cube of Brie cheese into the center of each dough cup.
Top each piece of cheese with 1 teaspoon of cranberry sauce.
Brush the exposed edges of the dough with the whisked egg wash and sprinkle the tops with chopped rosemary and sea salt.
Bake for 12 to 15 minutes, or until the dough edges are golden brown and the cheese is bubbling.
Remove from the oven and let the bites rest in the tin for 5 minutes before transferring to a wire rack or serving platter.