Preheat oven to 425 degrees, and line a baking sheet with parchment paper.
In a large bowl, combine the ground chicken and sausage, mixing with a fork to loosen the meat and break it up. Add the beaten eggs, shallots, garlic, breadcrumbs, parmesan, pepper flakes, oregano, parsley, basil, and 1/2 tsp each salt and pepper, and add about 1/4 cup tap water. Continue to mix everything using the fork so to not condense the mixture, but bring it together lightly.
Using an ice cream scoop, form approximately 20 meatballs onto the prepared baking sheet. Using a basting or pastry brush, glaze the top of each meatball with a thin coating of olive oil. Bake for 15 minutes, then remove from the oven to put the meatballs into a 9 x 12 baking dish. Pour the marinara sauce over the meatballs, top with foil, and return to the oven for another 10 minutes.
Pull out the baking dish, top with the provolone and shredded mozzarella, and bake for another 8-10 minutes until the cheese is melty and the sauce is bubbling. Top with fresh oregano, and enjoy!