Melt butter in a saucepan over medium heat.
Add chopped onions and serrano pepper and sauté until softened.
Add minced garlic and cook for another minute until fragrant.
Add Velveeta cheese and Habanero Jalapeño Cheddar cheese, stirring until melted.
Gradually whisk in whole milk and heavy cream until smooth.
Stir in salt, cumin powder, garlic powder, black pepper powder, and red chili powder.
Continue to cook and stir until the queso is heated through and has a creamy consistency.
Serve hot, garnished with tomatoes, cilantro, scallions, chopped serrano, and chopped onions if desired.
