Preheat your oven to 375°F (190°C).
In a large bowl, combine the ground beef, onion soup mix, breadcrumbs, eggs, and milk. Mix until just combined; do not overmix.
Shape the mixture into a loaf and place it in a loaf pan or on a baking sheet lined with parchment paper.
Bake for 60-70 minutes or until the internal temperature reaches 165°F (75°C).
Remove from the oven and let it rest for 5-10 minutes before slicing and serving.