To go vegetarian: Sub the meat for sofritas, fajita veggies, or extra beans.
To go dairy-free: omit the cheese or add dairy-free cheese or sour cream.
To go gluten-free: Sub flour tortillas for your favorite gluten free variety or use gluten free tortilla chips.
Other substitutions: Use whatever peppers you have in your refrigerator, color doesn’t matter! Use whatever canned beans you have on hand. Kidney or black beans are my go-to but northern beans or even chili beans would be fine too. Don’t have tortillas? Give it a try with crushed tortilla chips!