01 -  Preheat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or lightly grease using nonstick spray. 
 02 -  In a skillet over medium heat, melt butter. Add diced apples, brown sugar, ginger, cinnamon, and salt. Sauté for 5 to 7 minutes, stirring occasionally, until apples are tender and caramelized. Remove from heat and allow to cool briefly. 
 03 -  In a large mixing bowl, whisk together flour, granulated sugar, baking powder, baking soda, salt, and ground ginger until well combined. 
 04 -  In a separate bowl, whisk eggs, buttermilk, maple syrup, melted butter, and vanilla extract until smooth. 
 05 -  Pour wet mixture into dry ingredients. Stir gently until just combined; a few lumps are acceptable for the best texture. 
 06 -  Carefully fold the cooled caramel apple mixture into the batter, ensuring even distribution. 
 07 -  Divide batter evenly among the prepared muffin cups, filling each approximately three-quarters full. 
 08 -  Transfer to oven and bake for 20 to 22 minutes, or until muffins are golden and a toothpick inserted in the center comes out clean. 
 09 -  Allow muffins to cool in pan for 5 minutes. Use a spatula to transfer them to a wire rack. 
 10 -  Drizzle with additional maple syrup and sprinkle with chopped nuts if desired. Serve warm or at room temperature.