Brown beef in skillet over medium-high, breaking into small pieces; drain fat completely.

Cut Velveeta into 1-inch cubes for easier melting.

Add Velveeta, both Rotel cans with liquid, cooked beef, garlic powder, and cumin to slow cooker.

Cover; cook on low 1 hour, stirring every 20 minutes until cheese fully melts and smooths.

Keep on warm during party, stirring occasionally; garnish with cilantro if desired.

Serve with tortilla chips, corn chips, or soft pretzel bites.