Grab a bowl and pour some milk over the chicken livers enough to cover them.
Cover the bowl with plastic wrap and keep it in the fridge for 30 minutes.
After soaking the livers in milk, rinse them a few times with clean water until you remove all milk. Remove the excess water with paper towels.
Add some oil to a skillet and chop an onion. Add it to the skillet and cook them until translucent, about 2 minutes.
Add the chicken livers and sauté them together for another 5 minutes.
Add salt and pepper, thyme, marjoram, and a glass of white wine (or water).
Cover the skillet and let the liver cook on medium-low heat until it is cooked through and soft but not mushy and the liquid in the pan is almost evaporated.
Notes
How To Know When The Chicken Livers Are Cooked:
You’ll know chicken livers are perfectly cooked when they’re firm on the outside but still slightly soft and creamy on the inside. Here's how to check:
Visual Check: The outside should turn from a deep reddish color to a light brown or tan. Inside, the liver should no longer be bloody but have a faint pink center.
Temperature: Use a meat thermometer to ensure the internal temperature reaches 165°F (74°C) for safety.
Texture: When you press lightly with a fork, they should feel tender but not mushy.
Avoid overcooking, as this can make them grainy and dry. If you're unsure, cut into one to check—it's the easiest way to tell!