In a skillet or medium sauce pan, heat half and half over medium-high heat until you see bubbles around the edges (but not boiling).
Stir in half of the American cheese and half of the fontina cheese; stir until melted.
Stir in remaining cheese until all cheese is melted.
Add chilis and taco seasoning. If your taco seasoning does not have salt in it, add 1 teaspoon of House Seasoning Blend; stir until combined.
Serve warm with cilantro and extra chilis for garnish.
Notes
Make in a Crock Pot: A slow cooker is great for a party, using amini crockpot to keep it warm and incredible.
Add a little Color and Flavor: A quick way to adapt your Queso Blanco dip is to add a spoonful of Pico de Gallo or Salsa some cayenne pepper or hot green chilis.