Cooling/Resting Time: None
Cook breakfast sausage in a skillet over medium heat, breaking it up as it cooks, until no pink remains, 6 to 8 minutes.
Drain excess grease from sausage.
Add cooked sausage, cubed Velveeta, and entire can of Ro-Tel with liquid to slow cooker.
Cook on low for 2 hours without stirring frequently.
Stir in milk once cheese is completely melted.
Add more milk if too thick.
Switch to warm setting and serve with tortilla chips.