If you really like the feeling of smoke coming out your ears, like Cliff does, just add more taco seasoning to the recipe. But, for us "wimps", 2 tablespoons is just enough.
In a medium bowl, combine yogurt, Cheddar cheese and mayonnaise. Add taco seasoning, onion and green pepper. Mix well. Cover and refrigerate at least 1 hour. Gently stir again just before using.