Step 1: Preheat Oven and Prepare Pan: Preheat the oven to 350F (175C). Grease and flour a 9x5 inch loaf pan to prevent sticking. Alternatively, use baking spray.
Step 2: Combine Wet Ingredients: In a large bowl, whisk together the vegetable oil, eggs, milk or buttermilk, and vanilla extract until well combined. Ensure all ingredients are fully incorporated for a smooth batter.
Step 3: Incorporate Cake Mix: 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 bread. A few lumps are okay at this stage.
Step 4: Fold in Peaches and Optional Add-Ins: Gently fold in the diced peaches and any optional ingredients, such as chopped nuts or spices, until evenly distributed throughout the batter. Ensure the peaches are coated to prevent them from sinking to the bottom during baking.
Step 5: Transfer Batter to Pan: Pour the batter into the prepared loaf pan, spreading it evenly. Gently tap the pan on the counter to release any air bubbles.
Step 6: Bake Until Done: Bake in the preheated oven for 50-60 minutes, or until a wooden skewer inserted into the center comes out with only a few moist crumbs clinging to it. The top of the bread should be golden brown.
Step 7: Cool and Serve: Let the bread cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely. Slice and serve warm or at room temperature.
Optional Tips and Substitutions: For a richer flavor, use melted butter instead of vegetable oil. For a dairy-free option, use almond milk or soy milk in place of regular milk or buttermilk. You can also add a streusel topping for extra sweetness and crunch. Simply combine 1/4 cup flour, 1/4 cup brown sugar, 2 tablespoons butter, and a pinch of cinnamon; then crumble over the batter before baking.