01 -
Preheat oven to 350°F. Lightly coat a 9x12-inch baking pan with nonstick spray.
02 -
Blend together yellow cake mix, eggs, vegetable oil, peach nectar, and orange food coloring if using until smooth. Fold chopped peaches into the batter.
03 -
Spread batter evenly in the prepared pan. Bake for approximately 28 minutes, or until a toothpick inserted in the center emerges clean or with moist crumbs. Allow cake to cool slightly.
04 -
In a saucepan over medium heat, combine butter, heavy cream, and brown sugar. Stir constantly and bring mixture to a boil. Remove from heat and immediately add vanilla extract and sifted confectioner's sugar. Whisk until smooth and lumps dissolve, returning briefly to low heat if needed to achieve a pourable consistency.
05 -
Pour warm frosting evenly over the cake, aiming for full coverage in the initial pour as the icing sets quickly. Let frosting harden at room temperature or in the refrigerator before slicing and serving.