Make the dough: In a large bowl, combine the warm milk with the sugar and ¼ cup of the butter. Stir to combine. The butter should melt while combining.
1 cup milk, ½ cup granulated sugar, ½ cup unsalted butter
Add the yeast and eggs and whisk together. Add 4½ cups of flour. Use a wooden spoon to incorporate. The dough should be thick.
2½ teaspoons instant yeast, 2 large eggs, 4½ cups all-purpose flour
Transfer the dough to a floured surface and add the remaining ¼ cup of butter, 1 tablespoon at a time (4 tablespoons total), kneading well after each addition. Knead the dough for 8 minutes, or until the it is elastic and soft. If it’s too sticky, add a little extra flour, 1 tablespoon at a time.
Spray the inside of a glass bowl with cooking oil spray, then place the dough inside, flipping to coat the ball. Cover the bowl, place it in a warm place, and allow the dough to rise (it should double in size) for about 2 hours.
While the dough rises, make the filling: Mix the melted butter, brown sugar, spices, and chopped pecans in a small bowl. The mixture should resemble a thick caramel.
¾ cup brown sugar, ¾ cup unsalted butter, 1 tablespoon ground cinnamon, ½ teaspoon ground nutmeg, 1 cup chopped pecans
Once the dough has doubled in size, punch it down. Turn the dough out onto a lightly floured surface and roll it into a 20x16-inch rectangle.
Grease a 9x13-inch baking pan. Spread ⅓ of the filling into the bottom of the prepared pan. Set aside.
Spread the remaining filling over the rolled-out dough, leaving a 1-inch gap at one long edge. Roll up the dough, jelly-roll style, starting at the long end. Use a knife to cut the dough log into 12 large rolls and place them side-by-side on top of the filling coating the bottom of the prepared pan. Cover the baking pan and allow the rolls to rise for 40-60 minutes.
While the rolls are rising, preheat oven to 400°F.
Once the rolls have doubled in size, bake the rolls for 20-25 minutes, or until lightly golden brown. Remove from the oven and cool slightly before serving. Drizzle with icing (store bought or homemade) if desired.