In a frying pan over medium/high heat, cook ground sausage about 5 minutes and break into small pieces, until cooked through and no longer pink. Transfer to slow cooker.
Prepare ingredients by shredding or dicing cheeses (including cream cheese) into smaller pieces for quicker melting.
Combine pepperjack, white Velveeta, and cream cheeses along with milk, green chiles, and garlic powder in the slow cooker with the cooked sausage.
Cook on low heat 2-3 hours until cheese is completely melted, stirring occasionally.
Garnish with cilantro and/or salsa and serve warm.
Notes
Serve warm, keep warm by keeping in slow cooker on warm setting and stirring occasionally. Store refrigerated in an airtight container for up to 5 days.