Preheat oven to 350°F and grease a mini muffin tin with nonstick spray. Set aside.
Unroll the crescent roll sheets onto a lightly floured surface and brush each one with melted butter.
2 crescent dough sheets, 2 tablespoons unsalted butter
In a small bowl, combine the brown sugar, cinnamon, nutmeg, and salt. Sprinkle the mixture evenly over the crescent rolls.
⅓ cup brown sugar, 1 teaspoon ground cinnamon, ¼ teaspoon ground nutmeg, ⅛ teaspoon kosher salt
Roll the crescent rolls tightly into a log and slice into ¾-inch thick rolls-- you should have about 12 rolls per log.
Place one roll into a well of the prepared muffin pan and repeat with the remaining rolls.
Bake for 8-10 minutes, or until the rolls are set in the center and golden brown around the edges.
Serve the cinnamon rolls warm, topped with the icing (below).