Prepare 1 large loaf pan or 2 greased medium loaf pans (4 inches x 8 inches or one large 9 x 5 inch loaf pan). The pans should be almost full, we leave about a half an inch of space.
Using a cookie scoop, alternate the batters in a checkerboard pattern. Use about 1/9th of the batter per scoop and create two layers with 9 scoops, alternating each scoop. The bottom layer should start and end with the same flavor, while the top layer should alternate the opposite way so chocolate is on top of pumpkin and vice versa.
Using a butter knife, slightly swirl the mixture. Ensure to press the knife all the way to the bottom before swirling for the best effect.
If you are adding extra chocolate chips on top, sprinkle them on before baking
Bake at 300 F for ~1 hour 30 minutes (or until a toothpick comes out clean – oven temperatures vary so be sure to check with a toothpick starting at the hour mark)
Note: Bake time varies by pan size but for our 4×8 inch metal pan it takes 1 hour 25 minutes. If using a 9x5 inch large loaf pan the bake time will need to be increased.
Let cool before slicing. This can be stored at room temperature for ~3 days. Keep tightly wrapped in plastic or freeze