Preheat the oven to 350°. Put all the ingredients in a large bowl and use clean hands to gently toss them together until evenly mixed.
Lay a piece of parchment approximately 18×13 inches into a rimmed baking sheet, and turn the meat mixture onto the paper. Shape into a rounded loaf; then wrap completely in parchment to form a neat package, tucking the ends underneath.
Transfer the loaf on the baking sheet to the oven and bake until the internal temperature reaches 160°, about 1 ½ hours. Let cool 10 minutes; then remove the parchment and serve.