Preheat oven to 350F

Blend together the cake mix, eggs, oil, and nectar and food coloring, if using, until well combined. Fold in the peaches and turn the batter into a lightly sprayed 9x12 pan. Bake for about 28 minutes, or until done...you can check with a toothpick, it should come out without batter clinging to it, but moist crumbs are fine.

Put the butter, cream, and brown sugar in a saucepan and bring to a boil, stirring constantly. Take off the heat at add the vanilla and the sifted sugar. Whisk until well blended and the little lumps of sugar have disappeared. Put it back on a low heat if necessary.

Pour the frosting over the cake, trying to get it evenly coated on the first try, because it will set up quickly and you won't be able to spread it without cracking the surface.

Let the frosting harden at room temperature or in the refrigerator before cutting.