Adapted from a recipe in Faith Durand's "Not Your Mother's Casseroles." You need 1 lb of peeled potatoes, so you should start with about 1 1/4 lb. You can double this and make it in a 9x13 pan.
Preheat oven to 350°F Grease an 8x8 baking dish with non-stick spray an set aside.
Microwave peeled potato on high until barely tender, 3-4 minutes. Allow to cool slightly, then cut into 1/4" dice.
In a medium skillet over medium heat, heat oil until shimmering. Add the onion and a pinch of salt. Saute until onions are soft and translucent, about 5 minute Add garlic, bell peppers and half the salt, Saute until the peppers are fragrant and soft, about 5 minutes more. Remove from heat and set aside.
Whisk together eggs and milk with remaining salt and pepper. Add 3/4 c cheese, potatoes, crumbled bacon and sauteed vegetables. Stir well and spread into baking dish.
Bake in preheated oven for 30 minutes. Spread remaining cheese on top and return to oven until cheese is melted and top is puffy, about 15 minutes more. Serve at once.