Pulse the bread slices in a food processor until coarse crumbs form. Measure 3/4 cup crumbs into a large mixing bowl. Add the ground turkey, turkey sausage, egg, salt, Parmesan, and parsley. With your fingers or two forks, mix lightly until the ingredients are combined, being careful not to compact the meat. Form the mixture into 2-inch balls. You should have about 28 or so balls total.
Bring a large pot of salted water to a boil. Cook pasta until barely al dente according to package instructions. You want it to still be firmer than you would ordinarily eat it, as it will cook further in the oven. Drain, toss with a bit of olive oil to prevent sticking, then set aside.
Place a rack in the center of your oven and preheat to 400 degrees F.