Cookie Butter Hamantaschen with White Chocolate Drizzle

Name: Cookie Butter Hamantaschen with White Chocolate Drizzle
Ingredients: 8 tablespoons (1 stick) unsalted butter or vegan butter; 2 cups all-purpose flour, plus more for rolling; 1 teaspoon ground cinnamon; 1/2 teaspoon kosher salt; 1/4 teaspoon baking powder; 1/2 cup granulated sugar; 1 cup cookie butter, divided; 1 large egg; 1 tablespoon milk or unsweetened non-dairy milk; 1 teaspoon vanilla extract; 5 Biscoff cookies; 6 ounces white chocolate, or 1 cup white chocolate chips (see Recipe Notes if using chocolate chips); 2 teaspoons vegetable oil