In the bowl of a stand mixer, combine the potato flake starter, water, oil, salt, eggs, and the mashed potato flakes. Using the dough hook, on low speed, gradually incorporate the bread flour into the wet ingredients until a dough forms.
After adding the flour, knead for 6 minutes on low speed. This step helps develop the gluten in the dough, resulting in a better texture for the bread.
Cover the bowl with plastic wrap and allow it to rise until almost doubled. You can let it sit at room temperature for about 6 hours, or in a warm place such as a warm oven that is turned off with the light on for about 3 hours.
After the first rise, transfer the dough to a clean surface and divide into three equal pieces. This can vary depending on how large you want your sub rolls.
Gently pat and roll your dough into logs. With the pan I used, it made three 14 inch logs.
Mix together the oregano, garlic powder, and parsley. Spread out in a line on the clean surface. Spray the tops of the logs of dough with water to help the seasoning adhere to the dough.
Carefully dredge the tops of each log in the Italian herb seasoning blend. Place each log onto the loaf roll pan.
Cover with plastic wrap or place in an airtight container to prevent the dough from drying out. The dough should rise until a bit more than doubled. Allow it to rise at room temperature for about 8 hours or in a warm place such as a warm oven that is turned off with the light on for about 5 hours. You could allow it to sit at room temperature overnight and bake it the morning of the next day.
Preheat the oven to 375 degrees. Remove the plastic wrap from then risen dough. Sprinkle the tops of each loaf with shredded Colby and Monterey Jack Cheese.
Bake the garlic herb and cheese sub bread for 15-18 minutes at 375°F, or until it turn golden brown and sounds hallow when tapped on the bottom. If the bread is getting too brown on top before the time is up, you can tent some aluminum foil over the top to stop the browning and allow the bread to continue baking.
Allow the bread to cool on a wire rack for a few minutes before slicing it into desired lengths for sub sandwiches. The bread can be served warm or at room temperature, depending on your preference.