Preheat the oven to 350F and spray a 9x13 casserole dish with some nonstick cooking spray.
Cut the 10 small biscuits into 8 small pieces each (giving you 80 small dough pieces).
Spread the dough pieces in a casserole dish.
Cut the 40 pepperoni slices into 4 pieces each.
In a bowl, mix the egg whites, chopped peppers, cut pepperoni, 1/3 cup mozzarella, and 1 tsp Italian seasoning. Leave the remaining cheese and seasoning aside.
Pour the mixture over the biscuit pieces. Make sure the pepperoni and veggies are scattered around evenly.
Bake in the oven for 20 minutes, remove, and add the remaining 1/3 cup cheese and 1 tsp Italian seasoning. Cover with foil (spray foil with cooking spray to prevent sticking) and return to the oven for 25 minutes.
Cut into 6 equal servings, serve, and enjoy!