I always start by preheating the oven to 350°F so it’s ready when the batter is done. I grease my baking pan lightly to make sure the cake releases easily after baking.
In a large bowl, I combine the cake mix, eggs, oil, and peach nectar until smooth. Once mixed, I gently fold in the chopped peaches so they stay juicy and intact.
The batter goes into the prepared pan and bakes for about 28 minutes. I check doneness by inserting a toothpick into the center—it should come out mostly clean.
While the cake bakes, I melt butter, heavy cream, and brown sugar together in a saucepan until bubbling. I remove it from heat and whisk in vanilla and sifted sugar until glossy.
I pour the warm frosting over the hot cake right out of the oven. It spreads beautifully and starts to set almost instantly.
I let the cake cool completely so the frosting firms up before slicing. This step makes clean, beautiful servings.