Step 1: Prepare the Oven and Pan: Preheat the oven to 350F (175C). Grease and flour a 9x13 inch baking pan to prevent sticking. Alternatively, line the pan with parchment paper, leaving an overhang for easy removal.
Step 2: Combine Wet Ingredients: In a large mixing bowl, whisk together the vegetable oil, eggs, vanilla extract, and the reserved 1/4 cup of peach juice until well combined. This ensures a smooth base for the cake batter.
Step 3: Incorporate Dry Ingredients: Add the yellow cake mix to the wet ingredients. Gently stir until just combined. Be careful not to overmix, as this can result in a tough cake. A few lumps are perfectly acceptable.
Step 4: Fold in the Peaches: Gently fold in the drained sliced peaches into the cake batter. Distribute the peaches evenly throughout the mixture. The peaches add moisture and a burst of fruity flavor to every bite.
Step 5: Pour into Pan and Bake: Pour the batter into the prepared baking pan, spreading it evenly. If desired, sprinkle the optional cinnamon over the top. Bake in the preheated oven for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
Step 6: Cool and Serve: Allow the cake to cool in the pan for 10-15 minutes before slicing and serving. The cake can be served warm or at room temperature.
Step 7: Add Toppings (Optional): Dust with powdered sugar, top with a dollop of whipped cream, or a scoop of vanilla ice cream before serving. These additions provide a touch of elegance and extra flavor.
Optional Tips: For a richer flavor, substitute melted butter for the vegetable oil. Add a tablespoon of almond extract for a different flavor profile. If you prefer a denser cake, use a pound cake mix instead of yellow cake mix. To prevent the peaches from sinking to the bottom, toss them lightly with a tablespoon of flour before folding them into the batter.