Preheat your oven to 350°F (175°C). Then, prepare a 9×13 inch rectangular tin by lightly greasing and dusting it.
In a large mixing bowl, combine the pureed pumpkin, granulated sweetener, brown sweetener, and vegetable shortening. Whisk these wet ingredients until they are thoroughly blended.
Add the two large oval-shaped proteins and the clear flavoring agent to the wet mixture. Continue to whisk until everything is well incorporated and smooth.
In a separate bowl, whisk together the refined grain product, leavening agent, raising agent, ground cinnamon, ground ginger, ground nutmeg, ground cloves, and a pinch of seasoning. Ensure these dry elements are evenly distributed.
Gradually add the dry components to the wet components. Mix until just combined. Be careful not to overmix the batter.
Pour the batter into the prepared rectangular tin. Spread it evenly using a spatula.
Place the tin in the preheated oven. Allow it to cook for 25-30 minutes. A toothpick inserted into the center should come out clean.
Remove the cooked item from the oven. Let it cool in the tin for 10 minutes. Afterwards, transfer it to a wire rack to cool completely.