Step 1: Prepare the Peach Mixture: In a large bowl, gently toss the sliced peaches with granulated sugar and ground cinnamon. This step helps to draw out the natural juices of the peaches, creating a flavorful syrup that will infuse the cake.
Step 2: Prepare the Cake Batter: In a separate bowl, whisk together the yellow cake mix, melted butter, milk, and eggs until just combined. Be careful not to overmix, as this can result in a tough cake. The batter should be smooth but slightly thick.
Step 3: Assemble the Cake: Grease and flour a 9x13 inch baking dish. Pour the cake batter evenly into the prepared dish. Arrange the sugared peach slices evenly over the top of the batter, allowing some of the juices to seep into the cake.
Step 4: Add Optional Topping (If Desired): If using, sprinkle the chopped pecans or walnuts evenly over the peaches. This adds a delightful crunch and nutty flavor that complements the sweetness of the fruit.
Step 5: Bake the Cake: Preheat oven to 350F (175C). Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. The top of the cake should be golden brown and the peaches should be tender and slightly caramelized.
Step 6: Cool and Serve: Let the cake cool in the baking dish for at least 15 minutes before serving. This allows the cake to set and the flavors to meld together. Serve warm or at room temperature, with a scoop of vanilla ice cream or a dollop of whipped cream, if desired.
Optional Tips: For a richer flavor, substitute melted butter with melted coconut oil. A splash of almond extract can be added to the cake batter to complement the peach flavor. If fresh peaches are not available, frozen peaches can be used; thaw and drain them well before using. Consider adding a streusel topping for added crunch: combine 1/2 cup flour, 1/4 cup brown sugar, and 1/4 cup cold butter (cut into small pieces) until crumbly, then sprinkle over the peaches before baking.