Yes, you can bake in a paper-lined loaf pan (8.5 x 4.5 x 2.5), using the following adjustments:
Base mix: ½ cup of applesauce and ¼ cup of milk along with the same add ins. Bake at 350°F for 50-55 minutes.
Carrot currant masala: ¼ cup applesauce and ½ cup of milk along with 1 cup grated carrots. Bake at 350°F for 55 minutes.
Banana chocolate chip: No applesauce. ¼ cup milk along with 3 medium, ripe bananas. Bake at 350°F for about 1 hour. For easier slicing, refrigerate overnight before slicing.
Pumpkin spice: 2/3 cup milk along with 1 cup of pumpkin (and any other add ins). Bake at 350°F for 55-60 minutes.