Beat together sour cream and cream cheese. Want to reduce the lumps in your mixture, remove these 2 ingredients from the fridge 30 mins before mixing.
Add in chili powder a little at a time, until you reach the desired level of spiciness
Spread mixture into the bottom of your serving dish to create a layer approximately 1cm thick.
Layer on salsa and graded cheese. For best results, chill for 1 hour before serving.
Serve with tortilla chips. If you do happen to have any leftovers, however unlikely, you can cover and refrigerate for 4-5 days.