Preheat the oven to 350° F. Grease two 8- by 5-inch loaf pans.
In a large bowl, whisk together the eggs, sugar, vegetable oil, and canned pumpkin
In a heatproof bowl, melt the semisweet chocolate chips over a double boiler or in the microwave until fully melted. Set aside.
In a medium bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, nutmeg, and ginger.
Add the flour mixture to the pumpkin mixture and stir until just combined.
Add 1 cup of the pumpkin batter to the melted chocolate chips and stir until smooth and well-mixed.
Pour a 1-inch layer of the pumpkin batter in the bottom of each of the prepared loaf pans. Spoon a layer of the chocolate batter on top of each pan, taking care to keep the chocolate from spreading to the very edges
Divide the remaining pumpkin batter between both pans and carefully smooth it over the chocolate filling so that it completely covers the chocolate.
Bake for about 1 hour. Remove from oven and let cool in the pan for 10 minutes before turning out on onto a wire rack to finish cooling completely.