PREHEAT OVEN TO 350 DEGREES, SPRAY A 9X13" PAN WITH COOKING SPRAY AND SPRINKLE FLOUR ALL AROUND TO CREATE A NONSTICK SURFACE. BANG PAN SIDES WITH YOUR HAND OVER SINK TO GET RID OF EXCESS FLOUR.
FOLLOWING THE BOX CAKE DIRECTIONS: COMBINE BOX CAKE MIX, EGGS, UNSALTED BUTTER, AND WATER. MIX TOGETHER WITH A STAND OR HAND MIXER.
USING A GRATER/SHREDDER, SHRED APPLES WITH SKIN ON. TAKE HANDFULS OF SHREDDED APPLES AND SQUEEZE OUT EXTRA LIQUID OVER SINK. ADD TO CAKE MIX. FOLD IN GENTLY UNTIL COMBINED.
TRANSFER TO BAKING DISH. SMOOTH OUT TOP.
MELT BUTTER IN A MICROWAVEABLE BOWL, ADD IN CINNAMON AND SUGAR AND MIX WITH A FORK UNTIL WELL COMBINED. SPRINKLE ON TOP OF CAKE SURFACE EVENLY.
BAKE FOR 45-50 MINUTES, CHECK WITH A CAKE PICK OR STICK AT 40 MINUTES, SHOULD COME OUT CLEAN WITH NO WET BATTER.