Step 1

Arrange a rack in the middle of the oven and heat the oven to 350°F. Coat a 9x13-inch baking dish with cooking spray.

Step 2

Pour 1 can peaches and their juices into the baking dish. Drain the juice from the second can, then add the peaches to the baking dish.

Step 3

Sprinkle 2 tablespoons packed light brown sugar, 1 teaspoon ground cinnamon, 1/4 teaspoon ground nutmeg (if using), and 1/4 teaspoon kosher salt evenly over the peaches. Sprinkle 1 box yellow cake mix evenly over the peaches and spices.

Step 4

Cut 1 stick unsalted butter into very thin slices. Arrange over the cake mix, spacing then evenly apart and covering the entire surface. This cobblestone-like technique allows the butter to melt evenly and helps to avoid any dry spots.

Step 5

Bake until golden-brown and bubbly, 50 to 55 minutes. Serve warm or at room temperature with a scoop of vanilla ice cream.