Place all the ingredients in a medium bowl and use clean hands to combine.
Spread the mixture in a 9 X 13-inch baking dish, pressing on it to ensure it sticks together and to even it out.
Cover the pan tightly with foil. Bake the ground beef breakfast sausage until an instant-read thermometer registers 160 degrees F, about 45 minutes.
Using a wide slotted spatula, lift the baked ground beef breakfast sausage from the juices in the pan onto a wire rack that you’ve placed on foil. Allow to cool 10 minutes, then transfer to a cutting board and use a sharp knife to cut into squares.
Keep leftovers refrigerated, and reheat them in the microwave, or (tastier!) sauté in a skillet with a little olive oil.