Heat 1 tablespoon oil in a medium skillet over medium heat. Season both sides of chicken with salt and pepper; saute, turning once, until just cooked through, about 10 minutes. Transfer to a plate; let cool, then finely chop. Transfer chicken and any juices to a large bowl.
Heat remaining 3 tablespoons oil in skillet over medium heat. Add onion; cook, stirring occasionally, until softened, about 4 minutes. Add ginger, turmeric, and 1/2 teaspoon cinnamon; cook, stirring constantly, until fragrant, about 1 minute.
Stir 1/4 cup sugar into mixture. Add eggs; cook, stirring, until scrambled but still moist. Transfer to bowl with chicken. Stir in raisins if desired. Season with salt and pepper; let cool.
In a food processor, pulse almonds until finely ground. Transfer to a bowl; stir in remaining 1/2 cup sugar and 1 teaspoon cinnamon.
Preheat oven to 425 degrees. On a clean work surface, unfold a sheet of phyllo with a short side facing you; cover remaining sheets with a damp kitchen towel. Lightly brush with melted butter; sprinkle with about 1/6 of nut mixture. Lay another phyllo sheet on top; lightly brush with butter. Cut the stack lengthwise into thirds and then crosswise into thirds to make 9 equal rectangles.
Working with 1 rectangle at a time, place 1 tablespoon chicken mixture about 1 inch from end of a short side, leaving a 1/2-inch border on long sides. Fold 1/2 inch of each long side over filling. Starting from the end with filling, roll into a log. Repeat process to make remaining rolls (you should have 54). Brush with butter; arrange, seam sides down, on parchment-lined baking sheets. (B'steeyas can be frozen at this point, uncovered, until firm, about 1 hour; transfer to airtight containers, and freeze up to 6 weeks.)
Bake, rotating sheets halfway through, until golden brown and crisp, 12 to 15 minutes. Let cool slightly before dusting with sugar and cinnamon. Serve warm.