• Preheat oven to 350°. Spray a 12 cup Bundt pan with baking spray with flour.
  
• In a large mixing bowl, beat melted butter, 1 cup brown sugar, and granulated sugar with a mixer at medium speed until well combined.
  
• Add eggs, one at a time, beating well after each addition.
  
• Beat in vanilla.
  
• In a medium bowl, whisk together flour, baking powder, apple pie spice, and salt. With mixer on lowest speed, gradually add flour mixture to butter mixture beating until well combined.
  
• In a separate bowl combine chopped Granny Smith apples, cinnamon, and remaining ¼ up of light brown sugar.
  
• Spoon one-third of the batter into prepared Bundt cake pan.
  
• Top with half of the apple mixture. Repeat layers once.
  
• Top with remaining one-third of batter.
  
• Bake until cake tester or wooden pick inserted near center comes out clean, 50 minutes to one hour. Let cool in pan for 10 minutes.
  
• Remove from pan and let cool completely on wire rack.
  
• Top with Cream Cheese Frosting.
  
• Drizzle with caramel topping and sprinkle with chopped walnuts if desired.
  

Cream Cheese Frosting

• In a medium bowl, beat cream cheese and confectioners' sugar with a mixer at medium-low speed until smooth and creamy. Beat in milk. Beat in ¼ cup caramel topping if desired.