Prepare the Cranberry Sauce: In a saucepan, combine fresh cranberries, sugar, and water. Cook over medium heat, stirring occasionally, until the cranberries burst and the mixture thickens (about 10-15 minutes). Remove from heat and let cool.
Preheat the Oven: Preheat your oven to 375°F (190°C).
Prepare the Phyllo Dough: Lay out a sheet of phyllo pastry on a clean, flat surface. Brush lightly with olive oil. Repeat this with two additional sheets, stacking them on top of each other. Cut the layered phyllo into squares approximately 4x4 inches.
Form the Tartlet Cups: Gently press each square into a muffin tin cup to form a shell. Repeat until all phyllo squares are used.
Fill the Tartlets: Place small pieces of Brie cheese into each phyllo cup. Top with a spoonful of the cranberry sauce and a sprinkle of fresh rosemary and black pepper.
Make the Egg Wash: In a small bowl, beat the egg with a splash of water to create an egg wash. Brush the edges of the phyllo cups with the egg wash for a golden finish.
Bake the Tartlets: Place the muffin tin in the preheated oven and bake for 15-20 minutes, or until the phyllo is golden and crispy.
Cool and Serve: Once done, remove the tartlets from the oven and let them cool slightly before plating.
Notes
Serve warm on a platter garnished with extra rosemary and a drizzle of olive oil.