This is the simplest condiment that will instantly cool the heat of a good taco. Try on Vegetarian Bean & Kale Tacos, Rod's Fried Perch Tacos, or Chipotle Pork Tacos. It would also work as a dip for tortilla chips or as salad dressing for spicy greens like arugula or watercress.
Combine sour cream with chile and garlic powders, lime zest and juice and salt. Adjust seasoning as necessary with more lime juice and salt.