Combine: Add all ingredients to a large bowl and mix thoroughly (feel free to use your hands) until well-combined.
Bake: Place mixture in a bread pan, making sure it is evenly spread out. Sprinkle a little extra salt and pepper on top for a little "crust" on top (optional). Bake in the preheated oven for 1.5 hours.
Cool: Let cool slightly before transferring to a plate and cutting it into thick pieces with a sharp knife.
Serve: Enjoy immediately!
Video
Notes
Ground Beef/Ground Pork: if you don't have ground pork, you can use 1.5 pounds total of ground beef.
Spraying Bread Pan Beforehand: No need to spray the bread pan before use, there is enough fat in the meat that it doesn't end up sticking. But if you want to, it doesn't hurt.
Whole30/Paleo: use almond flour instead of old fashioned oats.
Gluten-Free: make sure the oats are certified gluten-free or sub for almond flour.
Storage: Store in an airtight container in the refrigerator for up to 3-5 days. It makes really good leftovers!