Mexican oregano is more aromatic than the Mediterranean oregano most cooks use, so it works especially well in spicy dishes.
1. Heat oil in pot over medium heat. Add onion, and sauté 5 minutes, or until golden. Stir in garlic, chile, cumin and oregano, and sauté 2 minutes. Add tequila, and simmer 1 minute, or until liquid has evaporated. Stir in chard. Cover, reduce heat to medium low, and steam 5 minutes, or until chard wilts. Uncover, and cook 3 minutes, or until liquid has evaporated.
2. Place 1 tortilla in skillet over medium heat. Sprinkle with 1/4 cup cheese. Top with 1/4 chard mixture and second tortilla. Cook 2 minutes per side, or until browned. Repeat with remaining ingredients. Slice into wedges; serve.