Step 1: Prepare the Oven and Pan: Preheat oven to 350F (175C). Grease and flour a 9x13 inch baking pan. This ensures the cake releases easily after baking.
Step 2: Combine Wet Ingredients: In a large bowl, combine the melted butter, milk, eggs, and vanilla extract. Whisk until well blended. The mixture should be smooth and uniform in color.
Step 3: Incorporate Cake Mix: Add the yellow cake mix to the wet ingredients. Gently stir until just combined. Avoid overmixing, as this can result in a tough cake. A few lumps are acceptable.
Step 4: Prepare the Peach Mixture: In a separate bowl, combine the sliced peaches, granulated sugar, and ground cinnamon. Toss gently to coat the peaches evenly. This step enhances the peach flavor and creates a slightly caramelized topping.
Step 5: Assemble the Cake: Pour the cake batter into the prepared baking pan. Spread evenly. Arrange the sugared peach slices on top of the batter. If desired, sprinkle sliced almonds over the peaches for added crunch and visual appeal.
Step 6: Bake the Cake: Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean. The cake should be golden brown on top, and the peaches should be tender and slightly caramelized.
Step 7: Cool and Serve: Remove the cake from the oven and let it cool in the pan for 10-15 minutes before slicing and serving. The cake can be served warm or at room temperature. Consider adding a scoop of vanilla ice cream or a dollop of whipped cream for an extra touch of indulgence.
Optional tips: To increase the peach flavor, add 1/4 cup of peach puree to the batter. For a richer flavor, substitute melted butter with melted coconut oil. For a gluten-free version, use a gluten-free cake mix and ensure all other ingredients are gluten-free. For a more rustic look and to add more crunch, consider adding a streusel topping before baking.