Double chocolate sliced loaf cake with chocolatey icing

CAKE: SUGAR, ENRICHED WHEAT FLOUR (WHEAT FLOUR, NIACIN, REDUCED IRON, THIAMINE MONONITRATE, RIBOFLAVIN, FOLIC ACID), EGGS, SOYBEAN OIL, SEMISWEET CHOCOLATE CHIPS (SUGAR, CHOCOLATE LIQUOR, COCOA BUTTER, DEXTROSE, SOY LECITHIN, SALT, NATURAL FLAVOR), WATER, BUTTERMILK (CULTURED LOWFAT MILK, NONFAT MILK, FOOD STARCH-MODIFIED, SODIUM CITRATE, LOCUST BEAN GUM, CARRAGEENAN, MONO- AND DIGLYCERIDES, SALT, VITAMIN A PALMITATE, VITAMIN D3), COCOA PROCESSED WITH ALKALI, BUTTER (CREAM [MILK], NATURAL FLAVOR), DRY WHOLE MILK, FOOD STARCH-MODIFIED, WHEAT STARCH, LEAVENING (SODIUM BICARBONATE, SODIUM ACID PYROPHOSPHATE, MONOCALCIUM PHOSPHATE), NATURAL FLAVOR, SALT, XANTHAN GUM. ICING: ICING SUGAR (SUGAR, CORNSTARCH), BUTTERMILK (CULTURED LOWFAT MILK, NONFAT MILK, FOOD STARCH-MODIFIED, SODIUM CITRATE, LOCUST BEAN GUM, CARRAGEENAN, MONO- AND DIGLYCERIDES, SALT, VITAMIN A PALMITATE, VITAMIN D3), PALM OIL SHORTENING, CORN SYRUP, BUTTER (CREAM [MILK], NATURAL FLAVOR), COCOA PROCESSED WITH ALKALI, GUAR GUM, NATURAL FLAVOR, MONO- AND DIGLYCERIDES.