01 - In a large mixing bowl, combine lukewarm whole milk, granulated sugar, and active dry yeast. Allow the mixture to sit until foamy, approximately 5 minutes. Incorporate melted unsalted butter, eggs, and salt, mixing thoroughly. Gradually blend in all-purpose flour until a soft, cohesive dough begins to form. Transfer to a floured work surface and knead for 6 to 8 minutes until the dough achieves a smooth and elastic texture. Place the dough in a greased bowl, cover, and allow it to rise in a warm environment until doubled in size, about 1 hour.
02 - Melt unsalted butter in a saucepan over medium heat. Stir in packed brown sugar, pure maple syrup, and salt until fully dissolved. Continue cooking for 2 to 3 minutes, ensuring the caramel is smooth and bubbling. Evenly pour the mixture into a greased 9x13-inch baking dish. Distribute chopped walnuts over the caramel base.
03 - In a bowl, mix the packed brown sugar and ground cinnamon until thoroughly combined.
04 - On a floured surface, roll the dough into a 16x12-inch rectangle. Gently spread softened butter over the entire surface. Evenly sprinkle the cinnamon-sugar filling across the buttered dough. Starting from a long edge, roll the dough tightly into a log. Slice into 12 uniform pieces.
05 - Place the sliced buns, cut-side up, into the baking dish, positioning them atop the walnut caramel. Cover lightly and let rise in a warm location until buns are visibly puffy, approximately 30–40 minutes.
06 - Preheat oven to 350°F. Bake the buns for 25 to 30 minutes, until the tops are golden brown and the caramel is bubbling at the edges.
07 - Remove the dish from the oven and let the sticky buns rest in the pan for 5 minutes. While still warm, carefully invert the baking dish onto a serving platter so the caramelized walnut topping becomes the crown.
08 - In a small bowl, whisk together powdered sugar, pure maple syrup, and enough milk to achieve a smooth, pourable consistency. Generously drizzle the glaze over the warm buns before serving.