Preheat oven to 400F.
Cut the biscuits into three equal discs. Press them into the cups of a sprayed muffin tin, pushing in on the corners and making sure they go all the way up the sides. Place in the oven and bake until golden brown, about 8-10 minutes.
While the biscuits are baking, place a medium skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Add the sausage and cook until golden brown, about 5 minutes. Add in the onions and mushrooms, and cook until tender, about 4-5 minutes. Add the pepperoni and roasted red peppers and mix to warm through.
Take muffin tin out of the oven and fill each pizza crust with about a tablespoon of sauce, a tablespoon of sausage-onion-pepper-mushroom mixture and a sprinkle of cheese. Place under the broiler until light brown and bubbling.