Caramel Apple Dump Cake

Name: Caramel Apple Dump Cake
Cook time: 1 h 15 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: Cooking spray; 5 large (9 oz.) Gala apples, peeled, cored, and cut into 1/4-in-thick slices (about 8 cups); 1/2 cup packed light brown sugar; 1 1/2 tsp. apple pie spice; 1/2 tsp. kosher salt; 1/4 tsp. ground nutmeg; 1 cup caramel candies (from 1 [11-oz.] pkg.) (such as Kraft Caramels), halved; 1 (15 1/4-oz.) pkg. yellow cake mix (such as Duncan Hines); 1 cup (8 oz.) unsalted butter, cut into 1/8-in.-thick slices