Step 1Saute garlic and onion in oil in nonstick skillet over medium heat 2 to 3 minutes. Remove casing from chorizo. Add chorizo to skillet. Saute, stirring chorizo to break up, until no longer pink, about 5 minutes.
Step 2Spoon 2 tablespoons chorizo mixture into bottom of each of 6 (16-ounce) oval baking dishes. Sprinkle combination of 1/2 cup Jack cheese and 1/2 cup panela cheese over chorizo in each casserole. Spoon dollops of remaining chorizo mixture over top of each.
Step 3Place casseroles on back of grill to melt cheese or bake at 400 degrees until cheese is melted and begins to brown around edges, 10 to 15 minutes. Sprinkle each casserole with green onion and cilantro. Serve with Fried Tortilla Chips.