Preheat the oven to 450° F. Grease a 9x13 inch baking dish with olive oil.Take the bread and run it under water until dampened but not soaked. Gently squeeze the excess water out of the bread and then crumble the dampened bread into pieces.In a bowl, combine the sausage, chicken, bread crumble, eggs, parmesan, shallots, garlic, pepperoncinis, and a pinch each of salt and pepper. Coat your hands with olive oil, then roll the meat into 2 tablespoon size balls, and place them into the prepared baking dish. Bake for 15 minutes or until the meatballs are crisp on the outside, but not yet cooked through on the inside.Remove from the oven and pour the marinara over top the meatballs. Cover the pan with foil and bake for 15 minutes longer, or until the meatballs are cooked through. Remove the foil and add the cheeses and oregano. Bake until the cheese is melted and golden, about 10 minutes. Serve topped with fresh oregano and your favorite pasta!