Spray a large saucepan with non fat cooking spray and set over medium heat.
Add onion and garlic and cook, stirring, until soft and beginning to brown, 4 to 5 minutes.
Add beer and cook until reduced slightly, about 1 minute.
Add 1 cup milk and bring to a simmer.
Meanwhile, whisk the remaining 1/4 cup milk and cornstarch in a small bowl. Add to the pan and cook, stirring vigorously, until bubbling and thickened, 1 to 2 minutes.
Reduce heat to low, add cheese and cook, stirring, until melted.
Stir in drained tomatoes, chilies, lime juice, salt, pepper, cilantro, green onions, chili powder and cumin .
Serve warm, garnished with a bit of cilantro.
Notes
Entire recipe makes 8 servingsServing size is ¼ cup