Step 1: Prepare the Oven and Pan: Preheat oven to 350F (175C). Grease and flour a 9x13 inch baking pan. This prevents the cake from sticking and ensures easy removal.
Step 2: Mix the Cake Batter: In a large bowl, combine the yellow cake mix, melted butter, eggs, milk, and vanilla extract. Mix until well combined, ensuring there are no lumps. Avoid overmixing, as this can result in a tough cake.
Step 3: Prepare the Peach Mixture: In a separate bowl, gently toss the sliced peaches with granulated sugar and ground cinnamon. This enhances the peach flavor and creates a light glaze during baking.
Step 4: Assemble the Cake: Pour the cake batter into the prepared baking pan, spreading evenly. Arrange the sugared peaches evenly over the batter. Optionally, sprinkle chopped pecans or walnuts over the peaches for added texture and flavor.
Step 5: Bake the Cake: Bake in the preheated oven for 35-40 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs. Monitor the cake closely to prevent overbaking.
Step 6: Cool and Serve: Let the cake cool in the pan for 10-15 minutes before slicing and serving. The cake can be served warm or at room temperature.
Tips: For a richer flavor, substitute melted butter with melted coconut oil. To enhance the peach flavor, add 1/4 teaspoon of almond extract to the batter. For a streusel topping, combine 1/2 cup flour, 1/4 cup sugar, 1/4 cup cold butter (cut into small pieces), and 1/4 teaspoon cinnamon; crumble over the peaches before baking.